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29 October, 19:43

How many unpaired electrons are contained in each element: (a) chlorine, (b) selenium, (c) cesium, and (d) phosphorus?

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  1. 29 October, 21:10
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    Answer:Se-2, Cl-1, Cs-1, P-1

    Explanation:

    Let us consider the groups the elements belong to

    Se - group 16, ns2np4 - two unpaired valence electrons

    Cl - group 17, ns2np5 - 1 unpaired electron

    Cs-group 1, ns1 - one unpaired electron

    P-group 15 - ns2np3 - three unpaired valence electrons
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