Physical Size
A scroll-driven journey through the scale of the universe, from subatomic structures to the largest known cosmic systems.
Electron
Proton
Lepton
Electron
An elementary particle with negative charge, essential to the chemistry of atoms.
The electron is the fundamental particle that gives atoms their chemistry and matter its electric currents. Experiments show no evidence of any internal structure, so its size is represented here by an upper bound rather than a measured diameter.
- upper bound
- < 1 × 10-19 m
Image: scaleofspace.org · CC BY-NC 4.0