Question

Why do elements in the same group or column of the periodic table have similar properties?

A.
They have the same number of protons.

B.
They have the same number of electron shells.

C.
They have the same number of outer shell electrons.

D.
They have the same number of neutrons.

Answer 1

In the periodic table, elements in the same group or family have similar chemicalproperties because they have the same number of valence electrons in their outer shells.