Question

if d3 is more stable than d5 then why 3rd IE of Mn is more than V?​

Answer 1

Answer:

Since there are five electrons in the d subshell the five electrons singly occupy all the five d orbitals. ... Since the Inner orbital (low spin) complex is more stable than the outer orbital (high spin) complex. Thus d3 configuration is more stable than d5 configuration in aqueous medium

Answer 2

Explanation:

Cr after attaining +3 OS, its electronic configuration becomes [Ar] 3d3. This makes it half-filled stable at the t2g level which means three sub-D orbitals i.e. dxy dyz dxz are half filled. As “half-filled t2g state is more stable than d5 configuration”, Chromium is more stable in its d3 state than its d5 state.