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Atomic Radii & Ionization Potential

The noble gas...

Question

The noble gas with highest ionization energy is :

A

He

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B

Ar

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C

Xe

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D

Kr

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Solution

The correct option is A He
Electronic configuration of He is $1 s^{2}$
$∴$ Electrons are strongly attracted by
the nuclear so has most ionization energy.
Going down the group, electron (outer) - nucleus
interaction decreases so I.E. also decreases.

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