Proton   A sub-atomic (ß link to atom) particle with a positive charge of 1.60 × 10^-19 coulombs and a mass of 1.672 × 10^-27 kg. Protons are found in the nucleus of atoms. Compare to the electron, neutron.

Used in the following modules: Atomic Theory I, Atomic Theory II, Chemical Reactions, Nuclear Chemistry, Research Methods: Modeling, The Mole, The Periodic Table of Elements