The simplest atom there is — one proton, one electron — and about 90% of every atom in the universe.
- Atomic number
- 1
- Atomic mass
- 1.008 u
- Phase
- Gas
- Electron configuration
- 1s¹
- Melting point
- 14.01 K · -259.1 °C
- Boiling point
- 20.28 K · -252.9 °C
- Density
- 0 g/cm³
- Electronegativity
- 2.2
- Period / Group
- 1 / 1
- Discovery year
- 1766