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Atomic: M.A.C. | Reference
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Krypton
Electrons per shell 2,8,18,8
Electron Configuration [Ar] 3d10 4s2 4p6 open electron config
Ground state 1S0
Atomic Volume 38.9 cm3 mol-1
Electronegativity 3.00
Magnetic ordering Non-magnetic
Mass magnetic susceptibility -4.4 x 10-9
Molar magnetic susceptibility -3.69 x 10-10
Speed of sound gas; 220. liquid; 1120 m s-1
Thermal Properties
Enthalpy of Atomization No data.
Enthalpy of Fusion 1.64 kJ mol-1
Enthalpy of Vaporisation 9.05 kJ mol-1
Heat Capacity 20.786 J mol-1 K-1
Thermal Conductivity 9.43 W m-1 K-1
Thermal Expansion No data.
Electrical Properties
Electrical resistivity No data.
Electrical conductivity ? 106/cm Ω
Chemical Properties
Ionization Potential  
First 13.999
Second 24.359
Third 36.95
Optical Properties
Refractive Index (gas) 1.000427
Energy Levels
Kα1 (intensity 100) 12.649 KeV
Kα2 (intensity 50) 12.598 KeV
Kβ1 (intensity 15.5) 14.112 KeV
Kβ2 (intensity 2.4) 14.3116 KeV
Kβ3 (intensity 7.6) 14.102 KeV
Lα1 (intensity 100) 1.586 KeV
Lα2 (intensity 10) 1.586 KeV
Lβ1 (intensity 36.6) 1.6366 KeV
Lβ3 (intensity 3.5) 1.7107 KeV
Lβ4 (intensity 0.2) 1.697 KeV
Lγ3 (intensity 3) 1.438 KeV
Ll (intensity 4.5) 1.3872 KeV
Atomic Radii
Empirical 103 pm
Bohr Radius 88 pm
Covalent Radius 110 pm
Van der Waals 202 pm
Triple covalent 108 pm
Metallic No data.
Oxidation States
Main Kr0, Kr+2
Other
Ionisation Energies (kJ mol-1) show graph
M - M+ 1350.7
M+ - M2+ 2350
M2+ - M3+ 3565
M3+ - M4+ 5070
M4+ - M5+ 6240
M5+ - M6+ 7570
M6+ - M7+ 10710
M7+ - M8+ 12200
M8+ - M9+ 22229
M9+ - M10+ 28900
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 59 65 74 84 99 120
Crystal Structure
Structure Cubic close packed
a = 570.6 pm
b = 570.6 pm
c = 570.6 pm
α = 90°
β = 90°
γ = 90°