Question

(ii) Which orbital in each of the following pairs is lower in
energy in a multi-electron system?
(a) 25.2p (b) 3p, 3d (c) 3s. 4s (d) 4d, 5f​

Answer 1

Explanation:

Using (n+l) energy rule,

Option a lower in

energy in a multi-electron system

So, Option A is correct.