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Krypton

Non-Metalgaseous
Symbol: Kr
Atomic number: 36
Atomic mass: 83.80
Group: Noble Gas
CAS-number: 7439-90-9

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Physical data
Isotopes
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Argon
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 8
Orbitals: [Ar] 3d10 4s2 4p6
Electronegativity: --, 2.7
1. Ionization potential: 13.9996 eV
2. Ionization potential: 24.359 eV
3. Ionization potential: 36.95 eV
Oxidation states: 2
Electrical conductivity: --
Melting point: -156.6 °C
Boiling point: -152.3 °C
Specific heat: 0.248 J/gK
Heat of fusion: 1.638 kJ/mol
Heat of vaporization: 9.029 kJ/mol
Thermal conductivity: 0.0000949 W/cmK
Atomic radius: 1.03 Å
Ionic radius: -- Å
Covalent radius: 1.12 Å
Atomic volume: 38.9 cm³/mol
Density (293 K): 0.003708 g/cm³
Crystal structure: cubic face centered
cubic face centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
78Kr 0.35 77.9204 0 -- --
79Kr 0 79 1/2 1.45d EC, β+ View
80Kr 2.27 79.9164 0 -- --
81Kr 0 80.917 7/2 2.1E05y EC View
82Kr 11.56 81.9135 0 -- --
83Kr 11.55 82.9141 9/2 -- --
83Krm 0 83 1/2 1.86h IT View
84Kr 56.9 83.9115 0 -- --
85Kr 0 84.913 9/2 10.73y β- View
85Krm 0 85 1/2 4.48h β-, IT View
86Kr 17.37 85.9106 0 -- --
87Kr 0 87 5/2 1.27h β- View
88Kr 0 88 0 2.84h β- View
89Kr 0 89 0 3.15m β- View
90Kr 0 90 0 32.3s β-, β- View

Other info

Name origin:Greek: kryptos (hidden)
Description:Colorless, odorless, tasteless rare noble gas.
Discovered by:Sir William Ramsey, M.W. Travers
Year:1898
Place:Great Britain
Sources:Forms 1 millionth of the atmosphere. Obtained from production of liquid air.
Use(s):Used in lighting products. Some is used as inert filler-gas in incandescent bulbs. Some is mixed with argon in fluorescent lamps. The most important use is in flashing stroboscopic lamps that outline airport runways.