# Question #7a915

Apr 22, 2016

$A = Z + N$
Where $A$ is the atomic number (also called mass number)
$Z$ is the number of protons.
$N$ is the number of neutrons

$e = Z$
The number of electrons will be equal to the number of protons.

#### Explanation:

The number of protons will always be equal to the number of electrons. This means that there is no net electric charge on the atom.

The atomic number is equal to the number of protons plus neutrons. This is also sometimes called the mass number . Your question is a little confusing on this point.