Hydrogen
Reactive Nonmetal
Hydrogen (H) is a chemical element with atomic number 1, classified as a reactive nonmetal. At room temperature it is a gas. It was discovered in 1766 by Henry Cavendish.
Properties
- Atomic number
- 1
- Atomic mass
- 1.008 u
- Category
- Reactive Nonmetal
- Group
- 1
- Period
- 1
- Block
- s-block
- Electron configuration
- 1s¹
- Phase at STP
- Gas
- Density
- 0.08988 g/L
- Melting point
- 13.99 K (-259.2 °C)
- Boiling point
- 20.27 K (-252.9 °C)
- Electronegativity
- 2.2
- Atomic radius
- 53 pm
- Ionization energy
- 13.598 eV
- Discovery
- 1766 · Henry Cavendish
Common uses
Fuel cells, rocket fuel, ammonia production
Did you know?
The most abundant element in the universe, making up about 75% of all matter.