Which one of the following lanthanic ions does not exhibit paramagnetism ?

Options

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

Explanation

Generally, paramagnetism is shown by lanthanoidions. The paramaagnetism arises due to presence of unpaired electorns in f - orbital.
`Lu^(3+)(4f^(14))` does not have unpaired electorns. Hence, it does not exhibit paramagnetism.