If `n = 6`, the correct sequence for filling of electrons will be.

Options

A. `ns rarr np rarr (n - 1) d rarr (n - 2) f`
B. `ns rarr (n - 2) f rarr (n - 1) d rarr np`
C. `ns rarr (n - 1) d rarr (n - 2) f rarr np`
D. `ns rarr (n - 2) f rarr np rarr (n - 1) d`

Answer

D

Explanation

To determine relative energies of different subshells, we should use (n + 1) rule:
(i) lower (n + 1) value mens lower energy
(ii) for the same (n + 1) value, lower n im[lies lower energy
`6s rarr 4f rarr 5d rarr 6p`