Question

What two particles have approximately the same mass?

Answer 1

The `"nucular"` particles: `"protons and neutrons"`.

Explanation:

The nuclear particles, protons and neutrons, are conceived to have a positive electronic charge, and a neutral charge respectively. The protonic mass is `1.672621898(21)xx10^(−27)*kg`.

And the neutron mass is `1.674927471(21)xx10^(−27)* kg`, so to a first approx. these masses are equal.

Data are from this site, and this [site.](https://en.wikipedia.org/wiki/Neutron) Protons and neutrons engage in the strong nuclear force, which, at nuclear ranges, is stronger than the electrostatic forces of repulsion that operates between the protons.