Template:Infobox krypton

Krypton
36Kr
Ar ↑ Kr ↓ Xe Periodic table bromine ← krypton → rubidium
Appearance
colorless gas, exhibiting a whitish glow in a high electric field Spectral lines of krypton
General properties
Name, symbol, number	krypton, Kr, 36
Pronunciation	/ˈkrɪptɒn/ KRIP-ton
Element category	noble gases
Group, period, block	18 (noble gases), 4, p
Standard atomic weight	83.798
Electron configuration	[Ar] 3d10 4s2 4p6 2, 8, 18, 8
History
Discovery	William Ramsay and Morris Travers (1898)
First isolation	William Ramsay and Morris Travers (1898)
Physical properties
Phase	gas
Density	(0 °C, 101.325 kPa) 3.749 g/L
Liquid density at b.p.	2.413 g·cm−3
Melting point	115.79 K, -157.36 °C, -251.25 °F
Boiling point	119.93 K, -153.22 °C, -244.12 °F
Triple point	115.775 K (-157°C), 73.2 kPa
Critical point	209.41 K, 5.50 MPa
Heat of fusion	1.64 kJ·mol−1
Heat of vaporization	9.08 kJ·mol−1
Molar heat capacity	5R/2 = 20.786 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 59 65 74 84 99 120
Atomic properties
Oxidation states	2, 1, 0
Electronegativity	3.00 (Pauling scale)
Ionization energies	1st: 1350.8 kJ·mol−1
	2nd: 2350.4 kJ·mol−1
	3rd: 3565 kJ·mol−1
Covalent radius	116±4 pm
Van der Waals radius	202 pm
Miscellanea
Crystal structure	cubic face-centered
Magnetic ordering	diamagnetic
Thermal conductivity	9.43×10-3  W·m−1·K−1
Speed of sound	(gas, 23 °C) 220, (liquid) 1120 m·s−1
CAS registry number	7439-90-9
Most stable isotopes
Main article: Isotopes of krypton
iso NA half-life DM DE (MeV) DP 78Kr 0.35% >1.1×1020 y β+β+ 2.846 78Se 79Kr syn 35.04 h ε - 79Br β+ 0.604 79Br γ 0.26, 0.39, 0.60 - 80Kr 2.25% 80Kr is stable with 44 neutrons 81Kr trace 2.29×105 y ε - 81Br γ 0.281 - 82Kr 11.6% 82Kr is stable with 46 neutrons 83Kr 11.5% 83Kr is stable with 47 neutrons 84Kr 57.0% 84Kr is stable with 48 neutrons 85Kr syn 10.756 y β− 0.687 85Rb 86Kr 17.3% 86Kr is stable with 50 neutrons

References

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