# What is a particle inside an atom that carries a positive electrical charge?

$\text{A proton...............}$
Note that the assignment of charge is entirely arbitrary, and a bit unfortunate for $\text{quantum chemists}$ (but not so for $\text{nucular physicists,}$ who don't have to be so careful in multi-proton as compared to multi-electron calculations.) The point is that charged, massive nuclear particles, $\text{protons}$, have an equal but opposite electronic charge to charged, extranuclear particles of negligible mass, $\text{electrons}$.