Krypton (Kr)
Krypton (Kr, element 36) is a noble gas in group 18, period 4. Atomic mass 83.798, electron configuration [Ar] 3d¹⁰ 4s² 4p⁶, uses and facts.
About Krypton
Krypton is a noble gas with the symbol Kr and atomic number 36. It is a gas at room temperature, and it sits in group 18, period 4 of the periodic table. Krypton was discovered in 1898 by William Ramsay.
Krypton key facts
- Atomic number: 36
- Symbol: Kr
- Atomic mass: 83.798 u
- Category: noble gas
- Group: 18
- Period: 4
- State at room temperature: gas
- Electron configuration: [Ar] 3d¹⁰ 4s² 4p⁶
- Electronegativity (Pauling): not assigned
- Melting point: 115.79 K (-157.36 °C)
- Boiling point: 119.93 K (-153.22 °C)
- Density: 0.003749 g/cm³
- Common oxidation states: 0, +2
Electron configuration
The electron configuration of krypton is [Ar] 3d¹⁰ 4s² 4p⁶. The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells. Krypton has 8 valence electrons.
Uses of krypton
- Lighting
- Lasers
- Photography flash
Did you know?
Yes, Superman's weakness is named after this real element. Krypton lasers are used for eye surgery.
Other elements in group 18 and neighbours
Frequently asked questions
What is the atomic number of krypton?
The atomic number of krypton is 36, which means every krypton atom has 36 protons.
What is the electron configuration of krypton?
The electron configuration of krypton is [Ar] 3d¹⁰ 4s² 4p⁶.
What group and period is krypton in?
Krypton is a noble gas in group 18, period 4.
What state is krypton at room temperature?
Krypton is a gas at room temperature.
What is krypton used for?
Krypton is used for lighting, lasers, photography flash.