Identify the transition element.

  • A
    $1s^2, 2s^2 2p^6, 3s^2, 3p^6, 4s^2$
  • B
    $1s^2, 2s^2 2p^6, 3s^2, 3p^6 3d^2, 4s^2$
  • C
    $1s^2, 2s^2 2p^6, 3s^2, 3p^6 3d^{10}, 4s^2 4p^2$
  • D
    $1s^2, 2s^2 2p^6, 3s^2, 3p^6 3d^{10}, 4s^2 4p^1$

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