Technical data for Krypton

Overview
NameKrypton
SymbolKr
Atomic Number36
Atomic Weight83.798
Density3.75 g/l[note]
Melting Point-157.36 °C
Boiling Point-153.22 °C

Thermal properties
PhaseGas
Melting Point-157.36 °C
Boiling Point-153.22 °C
Absolute Melting Point115.79 K
Absolute Boiling Point119.93 K
Critical Presure5.5 MPa (54.28 Atm)
Critical Temperature209.41 K
Heat of Fusion1.64 kJ/mol
Heat of Vaporization9.02 kJ/mol
Heat of CombustionN/A
Specific Heat248.05 J/(kg K)[note]
Adiabatic Index5/3
Thermal Conductivity0.00943 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density3.75 g/l[note]
Density (Liquid)N/A
Molar Volume0.02235
Refractive Index1.000427
Speed of Sound1120 m/s
Thermal Conductivity0.00943 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence2
Electronegativity3
ElectronAffinity0 kJ/mol
Ionization Energies
1350.8, 2350.4, 3565, 5070, 6240, 7570, 10710, 12138, 22274, 25880, 2.97×104, 3.38×104, 3.77×104, 4.31×104, 4.75×104, 5.22×104, 5.71×104, 6.18×104, 7.58×104, 8.04×104, 8.53×104 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockp
Group18
Period4
Electron Configuration[Ar]3d104s24p6
ColorColorless
Discovery
1898 in United Kingdom
Gas phaseMonoatomic
CAS NumberCAS7439-90-9

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeDiamagnetic
Curie PointN/A
Mass Magnetic Susceptibility-4.4×10-9
Molar Magnetic Susceptibility-3.69×10-10
Volume Magnetic Susceptibility-1.65×10-8

Abundances
% in Universe4×10-6%
% in SunN/A
% in MeteoritesN/A
% in Earth's Crust1.5×10-8%
% in Oceans2.1×10-8%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius88 pm
Covalent Radius110 pm
Van der Waals Radius202 pm
Crystal StructureFace Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
570.6, 570.6, 570.6 pm
Space Group NameFm_ 3m
Space Group Number225

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr
Isotopic Abundances
78Kr0.35%
80Kr2.28%
82Kr11.58%
83Kr11.49%
84Kr57%
86Kr17.3%

Notes on the properties of Krypton:
Density: Density at 0° Celsius.
Specific Heat: Value given for gas phase.