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KCET2021ChemistryClassification of Elements and Periodicity in Properties

The third ionisation enthalpy is highest in

Options

  1. Aalkali metals
  2. Balkaline earth metals
  3. Cchalcogens
  4. Dpnictogens

Correct answer

B. alkaline earth metals

Step-by-step 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.

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