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When we go down the groups, the principal quantum number (n) increase and the valence electrons are farther from the nucleus because

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the inner energy levels are filled with electrons

the outer energy levels are filled with electrons

the inner energy levels are not filled with electrons

None of the above

answer is A.

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Detailed Solution

When we move down the vertical column (group), the principal quantum number (n) increases and the valence electrons move farther from nucleus. This happens because the inner energy levels are filled with electrons.

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