Q.

Similarity in chemical properties of the atoms of element in a group of the periodic table is most closely related to:

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a

atomic numbers

b

atomic masses

c

number of principal energy levels       

d

number of valence electrons

answer is D.

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In a group of elements have similar electronic configuration of their valence shell in modern periodic table.

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Similarity in chemical properties of the atoms of element in a group of the periodic table is most closely related to: