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Question

Chemistry Question on Classification of elements & periodicity in properties

Which of the following iso-electronic ions has lowest ionisation energy ?

A

K+K^+

B

Ca2+Ca^{2+}

C

Cl−Cl^-

D

S2−S^{2-}

Answer

S2−S^{2-}

Explanation

Solution

In isoelectronic ions, greater the negative charge, lower the ionisation energy .