Krypton (Kr) is an inert metallic white chemical element of group 18, or the so-called noble gas group. This element is the lightest of the group, with a krypton atom measuring 84, slightly larger than an argon atom (at 73).

Krypton is a very rare gas, as it is only present at 0.00011% in the Earth's atmosphere. It is slightly denser than air, has a very low vapor pressure and is practically colorless. It can be produced in the laboratory from liquid air and is soluble in water.

Krypton is inert and is considered a "noble" gas, as it is low reactive and does not react with other elements. Its melting temperature is -157°C and its boiling temperature is -152°C. Its triple point is -152.2°C, -107.7°C and 5.1°C.

Krypton is used in fluorescent lamps to improve brightness and durability. It is also used in lasers, medical imaging devices and computers. It is also used to infuse some razor blades, to improve cutting efficiency. Krypton is also used in the manufacture of drugs and is an important source of isotopes for the diagnosis and treatment of cancer.

83.798

[Ar] 3d10 4s2 4p6

2
8
18
8

13.9996

Synthetic

Radioactive

Liquid

Gaseous

Electronic configuration diagram

Characteristics

Name	Krypton
Number	36
Atomic	83.798
Symbol	Kr
Fusion	-156.6
Boiling	-152.3
Density	0.003733
Period	4
Group	18

Discovery	1898 Ramsay and Travers
Abundance	0.001
Radius	1
Electronegativity	0
Ionization	13.9996
Number of isotopes	23
Electronic configuration	[Ar] 3d10 4s2 4p6
Oxidation states	2
Electron by energy level	2,8,18,8