Which of the following electronic configurations represents the highest second ionization energy for an element?

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

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