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  3. Chemistry
  4. Which of the following has highest ionisation energy?

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Q. Which of the following has highest ionisation energy?

Delhi UMET/DPMTDelhi UMET/DPMT 2008Classification of Elements and Periodicity in Properties

Solution:

Ionisation energy increases with decrease in size of atoms or ions.
$\xrightarrow[{Cs ^{+} Cl < Ar < K^{+}}]{\text{Increase in ionisation energy}}$
Since, $K^{+}$ has the smallest size, therefore, it has the highest ionisation energy among the given.