Question

The correct order of relative stability of half-filled and completely filled subshell is

• A. $p ^{3}> d ^{5}< d ^{10}< p ^{6}$
• B. $d^{5} < p^{3} < d^{10} < p^{6}$
• C. $d ^{5}> p^3 < d ^{10} < p ^{6}$
• D. $p ^{3}> d ^{10}< d ^{5}< p ^{6}$

Answer 1

Answer: (B)

Fully filled p-orbital is more stable than fully filled $d$-orbitals, that is, $p ^{6}> d ^{10}$.
Similarly, half-filled p-orbital is more stable than half-filled $d$-orbitals, that is, $p ^{3}> d ^{5}$.
Hence, the order is $p^{6}>d^{10}>p^{3}>d^{5}$.