Chemistry

Problem

Which of the following represents an excited state of an atom? a. [Ne] 3s^2 3p^6 4s^2 3d^8 b. [Ne] 3s^2 3p^6 4s^1 3d^5 c. [Ne] 3s^2 3p^6 4s^2 3d^1 d. 1s^2 2s^2 2p^5 3s^1

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