`La^(3+)` and `Lu^(3+)` are

Options

A. Both paramagnetic
B. Both diamagnetic
C. `La^(3+)` is diamagnetic and `Lu^(3+)` paramagnetic
D. None of these

Answer

B

Explanation

`La^(3+) to [Xe] 4f^0 5d^0 6s^0 , Lu^(3+) to [Xe] 4p^14 5d^0 6s^0`
No unpaired `e^(-s)` in 4f-orbitals `therefore` diamagnetic