A subatomic particle is a particle smaller than an atom. Protons, neutrons and electrons are subatomic particles that make up atoms.
The table shows the properties of these subatomic particles.
| Proton | Neutron | Electron | |
|---|---|---|---|
| Location | nucleus | nucleus | shells (energy levels) |
| Relative charge | +1 | 0 | –1 |
| Relative mass | 1 | 1 | 1⁄1836 |
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