Which of the inert gasses has the highest ionization enthalpy?

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Solution

The correct option is A He
Noble Gases have a very stable electron configuration, therefore, they have the highest amount of ionization energy within their periods. It decreases down a family because electrons farther from the nucleus are easier to remove. Largest to Smallest: Helium (highest ionization level in the periodic table)
Hence option A is correct answer.

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