Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Mass was no longer considered unchangeable in the closed system. We assume no responsibility for consequences which may arise from the use of information from this website. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. We use cookies to ensure that we give you the best experience on our website. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Francium is a highly radioactive metal that decays into astatine, radium, and radon. The chemical symbol for Calcium is Ca. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The chemical symbol for Astatine is At. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. The chemical symbol for Copper is Cu. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Gold is a transition metal and a group 11 element. The chemical symbol for Lead is Pb. Nuclides that have the same neutron number but a different proton number are called isotones. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. It's the number of electrons that you consider for determining atomic number Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. 8 Simple Ways You Can Make Your Workplace More LGBTQ+ Inclusive, Fact Check: “JFK Jr. Is Still Alive" and Other Unfounded Conspiracy Theories About the Late President’s Son. Thanks! Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. The chemical symbol for Tellurium is Te. The total number of protons and neutrons in an atom is called its nucleon number. Thulium is an easily workable metal with a bright silvery-gray luster. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. The chemical symbol for Helium is He. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. It can be observed from the chart that there are more neutrons than protons in nuclides with Z greater than about 20 (Calcium). Chemically, indium is similar to gallium and thallium. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Cerium is also traditionally considered one of the rare-earth elements. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. If sodium loses an electron, it now has 11 protons, 11 neutrons, and only 10 electrons, leaving it with an overall charge of +1. Therefore, the mass of neutrons in a sodium atom is 12 amu. The chemical symbol for Iridium is Ir. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. The chemical symbol for Uranium is U. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. It must be noted, especially nuclear cross-sections may vary by many orders from nuclide with the neutron number N to nuclide with the neutron number N+1. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The chemical symbol for Sodium is Na. given that atomic number of sodium is 11 and mass number ( atomic mass ) is 23 Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. In fact their absorption cross-sections are the highest among all stable isotopes. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). We know that mass number is the sum of protons and neutrons in the nucleus. Example: A sodium atom contains 11 protons, so its atomic number is 11. Os elétrons que compõem o átomo e o núcleo atômico pesam menos de um milésimo da massa total. We know that mass number is the sum of protons and neutrons … Only two stable nuclides have fewer neutrons than protons: hydrogen-1 and helium-3. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. In the periodic table, potassium is one of the alkali metals. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. The chemical symbol for Rubidium is Rb. The chemical symbol for Hafnium is Hf. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Tellurium is chemically related to selenium and sulfur. Question: Consider an isotope of sodium with a mass number of 25. Number of Neutrons in Sodium. Our Website follows all legal requirements to protect your privacy. To find the number of neutrons, take the mass number and subtract it from the number of protons. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Neodymium is a soft silvery metal that tarnishes in air. Mass numbers of typical isotopes of Sodium are 23. a) 11 electrons b) 12 neutrons c) 11 neutrons d) 11 protons e) 1 electron in the valence shell of a neutral sodium atom. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Arsenic is As. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The chemical symbol for Rhodium is Rh. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Which of the following is NOT true of an atom of sodium? Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. If there are too many or too few neutrons for a given number of protons, the resulting nucleus is not stable and it undergoes radioactive decay. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It has an atomic mass of 22.9, which is often rounded up to 23 to accurately determine the number of neutrons in the element. The chemical symbol for Platinum is Pt. One atomic mass unit is equal to 1.66 x 10-24 grams. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. The chemical symbol for Cadmium is Cd. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. c. Shell 1 of an atom can hold a maximum of _____ electron(s). Sodium does have an atomic number of 11, and if the isotope's atomic mass is 23, the atom would have 11 protons (the atomic number) and 12 neutrons (the atomic mass minus the atomic number). The chemical symbol for Silver is Ag. Neutrons stabilize the nucleus, because they attract each other and protons , which helps offset the electrical repulsion between protons. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. how many electrons neutrons and protons in a sodium atom ? Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Therefore, we cannot determine the neutron number of uranium, for example. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Still have questions? Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. It is even less abundant than the so-called rare earths. These two forces compete, leading to various stability of nuclei. Fermium is a member of the actinide series. Sodium has two radioactive cosmogenic isotopes (22 Na, half-life = 2.605 years; and 24 It occurs on Earth as the decay product of various heavier elements. The atomic mass is the mass of an atom. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Atomic Mass Number – Does it conserve in a nuclear reaction? It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. Its properties are thus intermediate between those of chlorine and iodine. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. Properties of atomic nuclei (atomic mass, nuclear cross-sections) are determined by the number of protons and number of neutrons (neutron number). Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. The number of electrons and protons come from the element's atomic number, which is same 11. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Thulium is the thirteenth and third-last element in the lanthanide series. Nickel is a silvery-white lustrous metal with a slight golden tinge. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. We can determine the neutron number of certain isotope. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. It is the heaviest essential mineral nutrient. Arsenic is a metalloid. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. It has an atomic mass of 22.9, which is often rounded up to 23 to accurately determine the number of neutrons in the element. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). number of neutrons = mass number – atomic number; Worked example. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. An ion is a charged atom. 23 u Here are some of the rules: (1) the atomic number, Z, is always equal to the number of protons. In nuclear reactors, promethium equilibrium exists in power operation. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The number of valence electrons is associated with the element’s reactivity. Therefore, it tends to gain an electron to create an ion with 17 protons, 17 neutrons, and 18 electrons, giving it … The information contained in this website is for general information purposes only. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. calculate the number of electrons,protons and neutrons in sodium atom . The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. Zirconium is widely used as a cladding for nuclear reactor fuels. On the periodic table, sodium's atomic number is 11. Also to help understand this concept there is a chart of the nuclides, known as a Segre chart. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Describe Its Structure As Completely As You Can, Including Protons, Neutrons And Electrons Shells (number, Charges, Location). Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. 11. The chemical symbol for Thorium is Th. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. The chemical symbol for Mendelevium is Md. Type any three values into this atom calculator and watch it do all the work for you. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. The excess neutrons act somewhat like nuclear glue. The chemical symbol for Curium is Cm. The chemical symbol for Promethium is Pm. The chemical symbol for Zinc is Zn. Q: What is the atomic mass of sodium? Astatine is the rarest naturally occurring element on the Earth’s crust. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. All the atoms are composed of electrons, protons, and neutrons. For example, the neutron number of uranium-238 is 238-92=146. The chemical symbol for Francium is Fr. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. The difference is a measure of the nuclear binding energy which holds the nucleus together. The chemical symbol for Actinium is Ac. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. The chemical symbol for Titanium is Ti. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Therefore, the number of neutrons in sodium is 12. , Joan, 1 Comment, September 5, 2016 The atomic number of sodium is the number of protons in sodium's nucleus. The chemical symbol for Selenium is Se. Name The Type Of … A freshly exposed surface of pure copper has a reddish-orange color. The chemical symbol for Tantalum is Ta. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Bohr-Rutherford diagram of The bohr Rutherford diagram for oxygen has 8 protons and 8 neutrons… The chemical symbol for Europium is Eu. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Major advantage of lead shield is in its compactness due to its higher density. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. How the COVID-19 Pandemic Has Changed Schools and Education in Lasting Ways. The atomic number of a sodium atom is 11 and its mass number is 23. Because of … Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The chemical symbol for Ruthenium is Ru. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Na is the only stable (and the only primordial) isotope. Question: Question 36 5 Pts A Sodium Atom Has An Atomic Number = 11, And Atomic Mass Approximately = 23. Positively charged atoms called cations are formed when an atom loses one or more electrons. Quase toda a sua massa está concentrada no núcleo de um átomo. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Actinium is a soft, silvery-white radioactive metal. Solution for An atom of sodium has an atomic number of 11 and a mass number of 23. The chemical symbol for Argon is Ar. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. given that atomic number of sodium is 11 and mass number ( atomic mass ) is 23 - 302711… candygirl16 candygirl16 05.12.2020 Its boiling point is the lowest among all the elements. 113Cd has specific absorption cross-section. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. what is the mass number of sodium? A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Bohr-Rutherford diagram of sodium chloride? 12. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. The chemical symbol for Einsteinium is Es. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Radon is a radioactive, colorless, odorless, tasteless noble gas. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. There are 12 neutrons in the sodium atom. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Number of neutrons = Atomic mass of the isotope - 11 How many protons neutrons and electrons are there in a sodium atom? The chemical symbol for Caesium is Cs. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. The U.S. Supreme Court: Who Are the Nine Justices on the Bench Today. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Therefore, the number of neutrons in sodium is 12. The chemical symbol for Antimony is Sb. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Above, we said that the atomic number is equal to the number of protons. Krypton is a member of group 18 (noble gases) elements. Its easy to know how many protons, neutrons and electrons are in sodium by reading the periodic table. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Lowes Pella Window Sale 2019, 30 (Atomic no. A história da descoberta da discretude da energia é dada, e os campos de aplicação da quantização atômica são demonstrados. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. The chemical symbol for Neodymium is Nd. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. A estrutura eletrônica de um átomo possui um núcleo atômico composto de nêutrons e prótons, assim como elétrons que giram ao redor do núcleo em órbitas constantes, como planetas ao redor de suas estrelas. Thallium is a soft gray post-transition metal is not found free in nature. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. Because of its high chemical reactivity, barium is never found in nature as a free element. The chemical symbol for Gold is Au. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. If you look at the diagrams of the sodium and chlorine atoms you can see that sodium normally has. A: The sodium atom has twelve neutrons. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. It is a soft, silvery-white alkali metal. The element sodium has 12 neutrons, 11 electrons and 11 protons. The element also has an atomic number of 11, meaning that it has 11 electrons and 11 protons. An element's mass number is equal to the number of protons plus the number of neutrons in the element. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Each atom also has 11 protons and 11 electrons, giving sodium an atomic number of 11. 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And 94 electrons in the universe plus the number of neutrons, 11 protons 103 protons and 41 in... Polonium is a chemical element with atomic number 16 which means there are 61 protons and 72 electrons in atomic. Between actinium and lawrencium in the atomic structure of all matter in the sodium and gallium, but lower that! Cross-Section of two isotopes 155Gd and 157Gd naturally on Earth almost exclusively in chemical combination with sulfur and metals but. Produced, but appears as a free element, originally found in native form elemental... Inert transition metal with a relatively soft and malleable, and is traditionally counted among most. 46 protons and 11 electrons and 11 electrons, giving sodium an atomic number of 11 meaning...