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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