# What does a neutral atom always contain?

Nov 28, 2016

$\text{Protons}$ and $\text{electrons}$ in equal numbers.

#### Explanation:

The neutral atom may also contain $\text{neutrons}$, massive nuclear particles of zero charge. However, the protium isotope, ""^1H, which is the most abundant material in the universe so far as I know, contains NO neutrons.

Protons, massive nuclear particles of unit positive charge, and electrons, extra-nuclear particles with negligible mass, AND unit negative charge, must be present in equal numbers in a neutral material, or atom.