# What is the charge on a proton?

The charge of a proton is +1.602xx10^(−19) $\text{Coulombs}$.
And of course the charge on a proton is equal and opposite to the charge on an electron, -1.602xx10^(−19) $\text{C}$.
Note that the sign convention is quite arbitrary. We could equally define the charge as -1.602xx10^(−19) $\text{C}$ provided we reversed the sign of the electronic charge. The point is that protons and electrons have $\text{opposite}$ charge.