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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: atomic numbers, atomic masses, number of principal energy levels, number of valence electrons

atomic numbers

atomic masses

number of principal energy levels

number of valence electrons

Solution:

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.