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Question

The element having high ionization enthalpy but zero election gain enthalpy is ________.

A
H
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B
F
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C
He
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D
Be
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Solution

The correct option is C He
Electronic configuration of 2He=1s2 which is fully filled outermost shell electronic configuration. The outermost shell of He is 1s which can accommodate a maximum of 2es and hence no extra e can be added to its' outermost shell. Hence EGE=0. Further having high IE due to its' fully filled state.

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