Question

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

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

Answer 1

Answer: (A)

atomic numbers

Answer 2

If elements are arranged in order of their increasing atomic numbers, element coming at intervals of $2,8,8,18,18,32$ and $32$ will have similar physical and chemical properties and thus grouped in one particular group.