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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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