Which of the following electronic configurations is not possible according to Hund's rule?

  • A
    $1s^2 2s^2$
  • B
    $1s^2 2s^1$
  • C
    $1s^2 2s^2 2p_x^1 2p_y^1 2p_z^1$
  • D
    $1s^2 2s^2 2p_x^2$

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