Which of the following has the greatest first ionization energy?

C e

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C

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C l

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C a

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C s

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Solution

The correct option is D $C l$
Ce, Ca and Cs are metals with low ionisation energy.
Chlorine is a non metal with very high ionisation energy as it has the tendency to gain electron for completing its octet. In fact chlorine is highly electronegative element.

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