MCQ
$Nd ^{2+}=$
- A$4 f^2 6 s^2$
- ✓$4 f^4$
- C$4 f^3$
- D$4 f ^4 6 s ^2$
$Nd ^{2+}=[ Xe ] 4 f ^4 5 d ^0 5 s ^0$
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Statement $II :$ there is no change when undergoing boiling
Statement $III :$ reverse of $I$ and $II$
Statement $IV :$ dimer formation in freezing and boiling state


What is $A$