Question

Which of the following electron configurations represents an excited state of the indicated atom?
A) Ne: 1s2 2s2 2p6
B) N: 1s2 2s2 2p3
C) P: 1s2 2s2 2p6 3s2 3p2 4s1
D) Na: 1s2 2s2 2p6 3s2 3p2 3s1
E) He: 1s2

Answer

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