Why first ionisation enthalpy

Question:

Why first ionisation enthalpy of Cr is lower than that of Zn?

Solution:

First ionisation enthalpy of Cr is lower than that of Zn. If we see the electronic configuration of Cr and Zn

Cr – [Ar] 3d5 4s1

Zn – [Ar] 3d10 4s2

Removing an electron from a half-filled 4s orbital requires lesser energy than removing an electron from a filled stable 4s orbital.

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