See explanation below.
Work Step by Step
a.) S = 1s2 2s2 2p6 3s2 3p4 b.) Kr = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 c.) Cs = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
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