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Question

Chemistry Question on Classification of elements & periodicity in properties

Which of the following has highest ionisation energy?

A

k+ k^+

B

Cl− Cl^-

C

ArAr

D

Cs+Cs^+

Answer

k+ k^+

Explanation

Solution

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