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