A proton has about 1,840 times the mass of an electron. Selected basis: approximate values.
Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.
9.109 × 10⁻³¹ kg - Mass; measured constant.
An electron is a fundamental subatomic particle with a negative electric charge, found in atoms and responsible for electricity and chemical bonding.
The length shown is the electron Compton wavelength, not its diameter. In the Standard Model the electron is treated as pointlike; the cloud is a schematic.
NIST — 2022 CODATA fundamental constants1.673 × 10⁻²⁷ kg - Mass; measured constant.
A proton is a positively charged particle found in the nucleus of atoms, made up of quarks.
Twice the approximately 0.8409 fm charge radius. The charge distribution has no hard boundary; the illustration is schematic.
NIST — 2022 CODATA fundamental constants
There’s always another scale
Fundamental physicsElectron9.109 × 10⁻³¹ kgAn electron is a fundamental subatomic particle with a negative electric charge, found in atoms and responsible for electricity and chemical bonding.
Fundamental physicsProton1.682 fmA proton is a positively charged particle found in the nucleus of atoms, made up of quarks.
Fundamental physicsPlanck length1.616 × 10⁻³⁵ mThe Planck length is a scale formed from fundamental physical constants.
MicroscopicHydrogen atom105.8 pmA hydrogen atom is the simplest neutral atom, with one proton in its nucleus and one electron around it.
MicroscopicDNA double helix2 nmDNA is the molecule that stores hereditary information in living organisms.Side by side
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scaleGot a good eye for scale?