Problem: Which ground-state electron configuration is  incorrect? a) Cr: [Ar]3d6 b) Ca: [Ar] 4s2 c) Na: 1s2 2s2 2p6 3s1 d) Zn: [Ar] 3d10 4s2 e) Kr: [Ar] 3d10 4s2 4p6

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Problem Details

Which ground-state electron configuration is  incorrect?

a) Cr: [Ar]3d6

b) Ca: [Ar] 4s2

c) Na: 1s2 2s2 2p6 3s1

d) Zn: [Ar] 3d10 4s2

e) Kr: [Ar] 3d10 4s2 4p6

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