Template:Infobox krypton

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36 bromine ← krypton → rubidium Ar ↑ Kr ↓ Xe Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	krypton, Kr, 36
Chemical series	noble gases
Group, Period, Block	18, 4, p
Appearance	colorless
Standard atomic weight	83.798(2)  g·mol−1
Electron configuration	[Ar] 3d10 4s2 4p6
Electrons per shell	2, 8, 18, 8
Physical properties
Phase	gas
Density	(0 °C, 101.325 kPa) 3.749 g/L
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, 73.2 kPa[1]
Critical point	209.41 K, 5.50 MPa
Heat of fusion	1.64  kJ·mol−1
Heat of vaporization	9.08  kJ·mol−1
Specific heat capacity	(25 °C) 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
Crystal structure	cubic face centered
Oxidation states	4,[2] 2
Electronegativity	3.00 (Pauling scale)
Ionization energies (more)	1st:  1350.8  kJ·mol−1
	2nd:  2350.4  kJ·mol−1
	3rd:  3565  kJ·mol−1
Atomic radius (calc.)	88  pm
Covalent radius	110  pm
Van der Waals radius	202 pm
Miscellaneous
Magnetic ordering	nonmagnetic
Thermal conductivity	(300 K) 9.43x10-3  W·m−1·K−1
Speed of sound	(gas, 23 °C) 220 m/s
Speed of sound	(liquid) 1120 m/s
CAS registry number	7439-90-9
Selected isotopes
Main article: Isotopes of infobox krypton iso NA half-life DM DE (MeV) DP 78Kr 0.35% 2.3×1020 y ε ε - 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 syn 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% 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