Krypton

36
Kr
Gruppe
18
Periode
4
Blok
p
Protons
Electrons
Neutrons
36
36
48
General Properties
Atomnummer
36
Atommasse
83,798
Mass Number
84
Kategori
Ædelgasser
Farve
Colorless
Radioactive
Nej
From the Greek word kryptos, hidden
Krystalstruktur
Fladecentreret Kubisk
History
Scottish chemist Sir William Ramsay and his assistant English chemist Morris Travers discovered krypton in 1898 in London.

They found krypton in the residue left from evaporating nearly all components of liquid air.

William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton.
Elektroner i hver skal
2, 8, 18, 8
Elektronkonfiguration
[Ar] 3d10 4s2 4p6
Kr
When ionized, krypton gas emits bright white light
Physical Properties
Tilstandsform
Gas
Massefylde
0,003733 g/cm3
Smeltepunkt
115,79 K | -157,36 °C | -251,25 °F
Kogepunkt
119,93 K | -153,22 °C | -243,8 °F
Smeltevarme
1,64 kJ/mol
Fordampningsvarme
9,02 kJ/mol
Varmefylde
0,248 J/g·K
Abundance in Earth's crust
1,5×10-8%
Abundance in Universe
4×10-6%
Vial
Billede akkrediteringer: Images-of-elements
Vial of glowing ultrapure krypton
CAS Number
7439-90-9
PubChem CID Number
5416
Atomic Properties
Atomradius
88 pm
Kovalent radius
116 pm
Elektronegativitet
3,00 (Paulings skala)
Ionization Potential
13,9996 eV
Atomic Volume
38,9 cm3/mol
Varmeledningsevne
0,0000949 W/cm·K
Oxidationstrin
2
Applications
Krypton is used in certain photographic flash lamps for high-speed photography.

Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways.

Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Krypton is considered to be non-toxic
Isotoper
Stable Isotopes
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr
Unstable Isotopes
69Kr, 70Kr, 71Kr, 72Kr, 73Kr, 74Kr, 75Kr, 76Kr, 77Kr, 79Kr, 81Kr, 85Kr, 87Kr, 88Kr, 89Kr, 90Kr, 91Kr, 92Kr, 93Kr, 94Kr, 95Kr, 96Kr, 97Kr, 98Kr, 99Kr, 100Kr, 101Kr