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Ionisation Energy

The highest f...

Question

The highest first ionisation energy among the following elements.

A

C s

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B

C l

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C

I

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D

L i

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Solution

The correct option is A $C l$
The first ionisation energy of nonmetals is very high and as we move down the group, it decreases so $C l$ have highest first ionisation energy among all.

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