1. Tardigrade
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  3. Chemistry
  4. The third ionisation enthalpy is highest in

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Q. The third ionisation enthalpy is highest in

KCETKCET 2021Classification of Elements and Periodicity in Properties

Solution:

Alkaline earth metals have $ns ^{2}$ configuration.
After the removal of $2^{\text {nd }}$ electron, they get stable noble gas configuration.