Which of the following has the highest value of ionisation energy?
A
Be
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B
He
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C
Ne
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D
Xe
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Solution
The correct option is B He All the noble gases have high IE as they are in the stable state so removal of electron requires lot if energy. This energy decreases down the group. He is the smallest atom and on top of the noble gases so it requires maximum IE as compared to Xe and Ne.