Which of the following electronic configurations is incorrect?

  • A
    $1s^2\, 2s^2\, 2p_x^2\, 2p_y^2\, 2p_z^0$
  • B
    $1s^2\, 2s^2\, 2p_x^1\, 2p_y^1$
  • C
    $1s^2\, 2s^2\, 2p_x^1\, 2p_y^1\, 2p_z^1$
  • D
    $1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^5\, 4s^1$

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