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The reactivity of Alkali metals varies, thus(A) 0 decreases down the group(B) increases down the group(C)is constant down the group(D)is constant up to sodium and then decreases

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Answer

(B) increases down the group

Explanation

Since the distance of the valence electrons from the nucleus keeps on increasing down the group, therefore the ionization energy keeps on decreasing. Hence the reactivity of alkali metals varies, thus increasing down the group; from lithium to francium.

The correct answer is (B) increases down the group

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