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Question

Atoms of elements in a group on the periodic table have similar chemical properties. This similarity is most closely related to the :

A
atomic numbers
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B
atomic masses
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C
number of principal energy levels
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D
number of valence electrons
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Solution

The correct option is D number of valence electrons
The chemical properties of the atoms of elements in a group of the periodic table is most closely related to the number of valence electrons. All the chemical properties can be justified just by the number of valence electrons.

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