Q33 / 180 · KCET 2021 · Chemistry

The third ionisation enthalpy is highest in

A
alkali metals
Correct answer
B
alkaline earth metals
C
chalcogens
D
pnictogens

Solution

The third ionisation enthalpy is highest in a alkaline earth metals because it achieves stable noble gas configuration after removal of two electrons. Further removal of electron from the completely filled orbital require high ionisation enthalpy.

Hence, the correct answer is option: 'B'.

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