Which of the following lantanide ion is paramagnetic ?

Options

A. `Ce^(4+)`
B. `Yb^(2+)`
C. `Lu^(3+)`
D. `Eu^(2+)`

Answer

D

Explanation

`Ceto [Xe]4f^1 5d^1 6s^2, Ce^(4+)to [Xe]`
`Yb to [Xe]4f^14 6s^2, Yb^(2+)to[Xe] 4f^14`
`Luto[Xe]4f^14 5d^1 6s^2, Lu^(3+)to[Xe]4f^14`
`Euto[Xe]4f^7 6s^2, Eu^(2+)to [Xe]4f^7`