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3 April, 18:23

what symbol would be included in the noble gas notation for an element that had valence electrons in the 5s sub shell

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  1. 3 April, 21:36
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    The answer is Kr (Krypton).

    This is because krypton has an electronic configuration of:

    1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

    Taking note of the sequence of electronic configuration:

    1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s

    It can be seen that Kyrpton's electronic configuration finishes just before the 5s subshell. Therefore, the noble gas notation for an element with valence electrons in the 5s subshell can use [Kr] as a shortcut to denote its electronic configuration. For example:

    If an element has 1 valence electron in the 5s subshell, the noble gas notation will be:

    [Kr] 5s1
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