The outer electronic configuration of $Gd \ (At. \ No. \ 64)$ is

  • A
    $4f^5 \ 5d^4 \ 6s^1$
  • B
    $4f^7 \ 5d^1 \ 6s^2$
  • C
    $4f^3 \ 5d^5 \ 6s^2$
  • D
    $4f^4 \ 5d^5 \ 6s^1$

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