Electron, Proton and Neutron
| Particle | Mass (g) | Mass (kg) | Mass (amu) | Charge (e.s.u.) | Charge (Coulomb) | Charge (units) | Symbol | Discoverer | Location |
|---|---|---|---|---|---|---|---|---|---|
| Electron | 9.108 x 10^-28 | 9.108 x 10^-31 | 0.005493 | -4.8 x 10^-10 | -1.602 x 10^-19 | -1 | e | J.J. Thomson | Outside the nucleus |
| Proton | 1.672 x 10^-24 | 1.672 x 10^-27 | 1.005757 | 1.602 x 10^-10 | 1.602 x 10^-19 | +1 | p | J.J. Thomson | In the nucleus |
| Neutron | 1.672 x 10^-24 | 1.672 x 10^-27 | 1.00898 | 0 | 0 | 0 | n | Chadwick | In the nucleus |