36 Kr 83.798
Krypton
Noble Gas
Krypton (Kr) is a chemical element with atomic number 36, classified as a noble gas. At room temperature it is a gas. It was discovered in 1898 by William Ramsay, Morris Travers.
Properties
- Atomic number
- 36
- Atomic mass
- 83.798 u
- Category
- Noble Gas
- Group
- 18
- Period
- 4
- Block
- p-block
- Electron configuration
- [Ar] 3d¹⁰ 4s² 4p⁶
- Phase at STP
- Gas
- Density
- 3.733 g/L
- Melting point
- 115.79 K (-157.4 °C)
- Boiling point
- 119.93 K (-153.2 °C)
- Electronegativity
- 3
- Atomic radius
- 88 pm
- Ionization energy
- 14 eV
- Discovery
- 1898 · William Ramsay, Morris Travers
Common uses
High-performance light bulbs, lasers, insulating windows
Did you know?
Named after Greek word for 'hidden' and used in Superman's home planet.