Which of the following has '$6$' unpaired $f-$electrons ?

  • A

    $Tm^{+3}  (Z = 69)$

  • B

    $Nd^{+3}  (Z = 60)$

  • C

    $Dy^{+3}  (Z = 66)$

  • D

    $Tb^{+3}  (Z = 65)$

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