Properties of elements in the same group are similar because of

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similar electronic configuration in valence shell

equal number of electrons in valence shell

filling of same orbital but of different shell

all are correct

answer is D.

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Detailed Solution

Elements in the same group have similar physical and chemical properties because they have the same number of valence electrons. So, their most properties are similar, as they react in the same manner as the group has the same number of valence electrons.

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