Question

To complete the statement.

Atoms of elements in the same group have the same number of
chemical properties.

This is why they have similar chemical properties.

Answer 1

Valence electrons

Step-by-step explanation:

I don't exactly understand the question. However, I do know that the main commonality between elements of the same group (column) is their valence electrons. Valence electrons are very important when it comes to bonding, ionization, etc.