Question

multiple choice question
if an atom has 2 electrons in its innermost shell and 3 electrons in its outmost shell, how many valence electrons does it have?
o 3
o 2
o 5
o 1

Explanation:

Step1: Recall valence - electron definition

Valence electrons are electrons in the outermost shell of an atom.

Step2: Identify outermost - shell electrons

The atom has 3 electrons in its outermost shell.

Answer:

A. 3