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.
Compounds you can make with krypton
Krypton appears in one compound in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
-
KrF2
Krypton Difluoride
A rare compound of a "noble" gas, only stable when kept extremely cold.