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Question

The trend in atomic radii on moving down a group, with reference to the alkali metals in Group-1[I A]

A
increases
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B
decreases
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C
remain constant
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D
none of these
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Solution

The correct option is A increases
Moving down a group in the periodic table, the number of electrons and filled electron shells increases, but the number of valence electrons remains the same. The outermost electrons in a group are exposed to the same effective nuclear charge, but electrons are found farther from the nucleus as the number of filled energy shells increases. Therefore, the atomic radii increase.
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