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

Options

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

Answer

C

Explanation

`{:(Sm^(2+)(Z = 62),[Xe]4f^6-6 " unpaired "e^-),(Eu^(2+)(Z=63),[Xe]4f^7 6s^2-7 " unpaired"e^-),(Yb^(2+)(Z=70),[Xe]4f^(14)6s^(2)-0 " unpaired " e^-),(Ce^(2+)(Z =58),[Xe]4f^1 5d^16s^2 -2 "unpaired" e^-):}`
Only `Yb^(2+)` is diamagnetic.