Statement 1: Potassium has a lower first ionization energy than lithium.

Statement 2: Potassium has more protons in its nucleus than lithium.

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

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Both Statement 1 and Statement 2 are correct but Statement 2 is not the correct explanation of Statement 1.

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Statement 1 is correct but Statement 2 is not correct.

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Statement 1 is not correct but Statement 2 is correct.

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Both the Statement 1 and Statement 2 are not correct.

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Solution

The correct option is A
Both Statement 1 and Statement 2 are correct but Statement 2 is not the correct explanation of Statement 1.

Both $L i$ and $K$ are alkali metals (group I metals). The atomic size of $K$ is greater than the atomic size of $L i .$ The extent of shielding of valence electrons from nuclear charge is also higher in potassium than in lithium. Thus, in potassium, the valence electrons can be relatively easily removed. Hence, the ionization potential of potassium is lower than the ionization potential of $L i .$

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Statement 1: Potassium has a lower first ionization energy than lithium. Statement 2: Potassium has more protons in its nucleus than lithium.

Statement 1: Potassium has a lower first ionization energy than lithium.

Statement 2: Potassium has more protons in its nucleus than lithium.