Q. 34

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

Answer :

The electronic configuration of Cr and Zn is given below

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 fully filled stable 4s orbital.


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