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

Options

A. `p^(3) gt d^(5) lt d^(10) lt p^(6)`
B. `d^(5) gt p^(3) lt d^(10) lt p^(6)`
C. `d^(5) gt p^(3) gt d^(10) gt p^(6)`
D. `p^(3) lt d^(10) lt d^(5) lt p^(6)`

Answer

C

Explanation

Full - filled `p`-orbital is more stable than full - filled `d`-orbitals, i.e. `p^(6) gt d^(10)`.
Similarly, half -filled `p`-orbital is more stable than half - filled `d`-orbital, i.e. `p^(3) gt d^(5)`.
Hence the order is `p^(6) gt d^(10) gt p^(3) gt d^(5)`.