Which one of the following configurations represents a noble gas?

  • A
    $1s^2, 2s^2 2p^6, 3s^2$
  • B
    $1s^2, 2s^2 2p^6, 3s^1$
  • C
    $1s^2, 2s^2 2p^6$
  • D
    $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$

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