Consider the electronic configuration of 2 elements:

(P) $1s^2,2s^{2}2p^6,3s^{2}3p^3$ (Q) $1s^2,2s^{2}2p^6,3s^{2}3p^4$

Choose the incorrect option :

The outer shell configuration of an element affects the electron's affinity.

Here P is more stable and reluctant towards electron change. So its electron affinity is more than Q.