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

Option: 1

 atomic numbers


Option: 2

 atomic masses


Option: 3

  number of principal energy levels


Option: 4

 number of valence electrons


Answers (1)

As learnt in

Modern periodic law -

The physical and chemical properties of elements are periodic functions of their atomic number.

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 Elements that are in the same group, most of the times, have the same number of valence electrons. The number of valence electrons is directly related to the chemical properties of elements. 

Hence, the option number (4) is correct.

Posted by

Kshitij

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