Question

How do you find the number of valence electrons?

Answer 1

Refer to the explanation.

Explanation:

For the representative (main group) elements, which are groups 1-2, and 13-18, or groups IA-IIA, and IIIA-VIIIA, the group number indicates the number of valence electrons.

Groups 1-2, or IA-IIA, have two valence electrons.

Groups 13-18, or IIIA-VIIIA, the number of valence electrons are 3-8.