All things · Atoms & Molecules
Hydrogen atom: how big is it?
Hydrogen atom is about 106 pm. In everyday terms, that is ≈ 1 times smaller than a hydrogen atom.
- Size
- 106 pm
- In metres
- 1.06 × 10⁻¹⁰ m
- Everyday comparison
- ≈ 1 times smaller than a hydrogen atom
- Chapter
- Atoms & Molecules
Did you know?
One proton, one electron. If the nucleus were a marble, the whole atom would be about a kilometre wide.
How it compares
- About 7,100× bigger than Uranium nucleus (15 fm).
- About 2.6× smaller than Water molecule (275 pm).
Other things of a similar size
- Water molecule 275 pm
- Gold atom 288 pm
- Glucose molecule 900 pm
- DNA (width) 2 nm
- Haemoglobin 5.5 nm
- Antibody 12 nm
Sizes are rounded, typical values drawn from standard reference sources, including NIST/CODATA physical constants and NASA's planetary fact sheets. Real objects vary; see About for how sizes are chosen.