Which element from following has half-filled $\mathrm{f}$ orbital in +3 oxidation state

Which element from following has half-filled $\mathrm{f}$ orbital in +3 oxidation state
  1. $\mathrm{U}(\mathrm{Z}=92)$
  2. $\operatorname{Lr}(\mathrm{Z}=103)$
  3. $\mathrm{Cm}(\mathrm{Z}=96)$
  4. $\mathrm{Th}(\mathrm{Z}=90)$

Solution

$\mathrm{Cm}^{+3}=[\mathrm{Rn}] 5 \mathrm{f}^7$

Asked in: MHT CET 2022 (11 Aug Shift 1)

Practice more Transition and Inner Transition Elements questions on Aicharya