Question

The correct order of relative stability of half filled and completely filled sub-shell 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

The correct option is C $d^5<p^3<d^{10}<p^6$

Completely filled and half filled $p-$ subshells are more stable than completely filled and half filled d-subshells. This is because for the same value of n, p-orbitals are more close to the nucleus than the d-orbital.