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Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). And, the third (last) shell has 1 electron. Argon has eight valence electrons. It is a nonmetal and a gas at room temperature. Hassium: Value is a guess based on periodic table trend. The attraction between this lone valence electron and the nucleus with 11 protons is shielded by the other 10 core electrons. Valence = 4___ The electron configuration of tin is [Kr] 5s 2 4d 10 5p 2. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Note that the valence electrons are often all of those after the noble gas core, but not always. Meitnerium: Value is a guess based on periodic table trend. Sn. the symbol of the preceding noble gas: [Ar] 4s2 3d10 4p5. A noble gas core is an abbreviation in an atom's electron configuration where the previous noble gas's electron configuration is replaced with the noble gas's element symbol in brackets. The chemical symbol for Argon is Ar. It is in group 18 of the periodic table and is a noble gas. Because its outer electron shell is full, it is chemically unreactive. Noble gas core notation: The core is the innermost electrons found by. However it is classed as having 10 core electrons and 7 valence electrons. This means the first shell (1s) has 2 electrons. The second shell (2s and 2p) has a total of 8 electrons. The electron configuration for cesium is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 1. The argon core, [Ar], is composed of the core electrons in calcium. Seaborgium: Value is a guess based on periodic table trend. In order to write the Argon electron configuration we first need to know the number of electrons for the Ar atom (there are 18 electrons). Bohrium: Value is a guess based on periodic table trend. Its electron configuration is 1s2 2s2p6 3s2p6, so it has three filled electron shells of 2, 8 and 8. So it has 2 core and 4 valence electrons Chlorine 2,8,7 (1s1 2s2 2p6 3s2 3p5) has 17 electrons, in in group 7 but has a valency of 1. abbreviating the electron configuration with. So 12 core and 1 valence Carbon 2,4 (1s1 2s2 2p2) has 6 electrons, is in group 4 and a valency of 4. Argon is a chemical element with the symbol Ar and atomic number 18. 18-8= 10 The first and second shells comprise the core (inner) electrons = 2 + 8 = 10 electrons. Notes on the Electron Configuration of particular elements: Dubnium: Value is a guess based on periodic table trend. Argon was discovered by Sir William Ramsay in 1894. The atomic number of argon is 18. Writing an electron configuration using the noble gas core can save you a lot of time! Argon contains 18 electrons, so calcium contains 18 core electrons. 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