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Hydrogen has high ionization energy than alkali metals, due to its:

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large size

small size

higher nuclear charge

more penetration power of s-subshell electrons

answer is B.

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Detailed Solution

Hydrogen has high ionization energy than alkali metals, due to its small size

There is just one orbital in hydrogen, and it is strongly drawn to the nucleus. It is therefore much smaller than the alkali metal and As a result hydrogen has a higher ionization enthalpy.

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