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Technical data for Krypton

Click any property name to see plots of that property for all the elements.

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 Pressure5.5 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
Neel PointN/A
Thermal Conductivity0.00943 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density3.75 g/l[note]
Density (Liquid)N/A
Molar Volume0.02235
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk ModulusN/A
Shear ModulusN/A
Young ModulusN/A
Poisson RatioN/A
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
Heat of CombustionN/A
DOT Hazard Class2.2
DOT Numbers1970
EU NumberEU231-098-5
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberRTECSOC6772500
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockp
Group18
Period4
Electron Configuration[Ar]3d104s24p6
ColorColorless
Discovery
1898 in United Kingdom
Gas phaseMonoatomic
CAS NumberCAS7439-90-9
CID NumberCID5416
Gmelin NumberGmelin16201
NSC NumberN/A
RTECS NumberRTECSOC6772500

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
Decay ModeN/A
Quantum Numbers1S0
Neutron Cross Section25
Neutron Mass Absorption0.013
Known Isotopes
69Kr, 70Kr, 71Kr, 72Kr, 73Kr, 74Kr, 75Kr, 76Kr, 77Kr, 78Kr, 79Kr, 80Kr, 81Kr, 82Kr, 83Kr, 84Kr, 85Kr, 86Kr, 87Kr, 88Kr, 89Kr, 90Kr, 91Kr, 92Kr, 93Kr, 94Kr, 95Kr, 96Kr, 97Kr, 98Kr, 99Kr, 100Kr
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.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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