Nitrogen
Reactive Nonmetal
Nitrogen (N) is a chemical element with atomic number 7, classified as a reactive nonmetal. At room temperature it is a gas. It was discovered in 1772 by Daniel Rutherford.
Properties
- Atomic number
- 7
- Atomic mass
- 14.007 u
- Category
- Reactive Nonmetal
- Group
- 15
- Period
- 2
- Block
- p-block
- Electron configuration
- [He] 2s² 2p³
- Phase at STP
- Gas
- Density
- 1.251 g/L
- Melting point
- 63.15 K (-210.0 °C)
- Boiling point
- 77.36 K (-195.8 °C)
- Electronegativity
- 3.04
- Atomic radius
- 56 pm
- Ionization energy
- 14.534 eV
- Discovery
- 1772 · Daniel Rutherford
Common uses
Fertilizers, explosives, food preservation, liquid nitrogen cooling
Did you know?
Makes up 78% of Earth's atmosphere but is chemically unreactive as N₂.