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3 June, 11:20

Which element has atoms in the ground state with greatest number of valence electrons?

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  1. 3 June, 11:33
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    You need a list of elements to compare.

    The procedure is to wirte the electron configuration and compare the number of electrons in the valence electron shell.

    I will work with this list, to show you the procedure

    (1) tin

    (2) sulfur

    (3) arsenic

    (4) fluorine

    element atomic number number of abbreviated electron

    electrons configuration

    tin 50 50 [Kr] 5s^2 4d^10 5p2

    sulfur 16 16 [Ne] 3s^2 3p^4

    arsenic 33 33 [Ar] 4s^2 3d^10 4p^3

    fluorine 9 9 [He] 2s^2 2p^5

    The valence electrons are those in the last shell.

    So, fluorine has 2 + 5 = 7 valence electrons, while tin has 2 + 2 = 4, sulfur has 2 + 4 = 6 and aersenic has 2 + 3 = 5.

    Therefore, the answer is fluorine.
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