The element with the highest ionization energy is:

lithium

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hydrogen

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helium

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neon

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Solution

The correct option is C helium
He contains fully filled $1 s^{2}$ orbital which has more penetrating effect and is very close to the nucleus and hence has higher value of ionisation energy.

Hence , option C is correct .

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Similar questions

Among the following the element with highest first ionization energy is:

1^{s t}

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