Which of the following lanthanoid ions is diamagnetic ?
(At nos . `Ce = 58 , Sm = 62, Eu = 63 , Yb =70)

Options

A. `Yb^(2+)`
B. `Ce^(2+)`
C. `Sm^(2+)`
D. `Eu^(2+)`

Answer

A

Explanation

Dimagnetic – no unpaired `e^(-)` present
`Yb^(2+) = 70 [Xe] 6s^@ 4f^14 5d^@` unpaired `e^(-)` = zero.