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Technical data for Chromium

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Overview
NameChromium
SymbolCr
Atomic Number24
Atomic Weight51.9961
Density7.14 g/cm3
Melting Point1907 °C
Boiling Point2671 °C

Thermal properties
PhaseSolid
Melting Point1907 °C
Boiling Point2671 °C
Absolute Melting Point2180 K
Absolute Boiling Point2944 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion20.5 kJ/mol
Heat of Vaporization339 kJ/mol
Heat of CombustionN/A
Specific Heat448 J/(kg K)[note]
Adiabatic IndexN/A
Neel Point393 K
Thermal Conductivity94 W/(m K)
Thermal Expansion4.9×10-6 K-1

Bulk physical properties
Density7.14 g/cm3
Density (Liquid)6.3 g/cm3
Molar Volume7.2824×10-6
Brinell Hardness1120 MPa
Mohs Hardness8.5 MPa
Vickers Hardness1060 MPa
Bulk Modulus160 GPa
Shear Modulus115 GPa
Young Modulus279 GPa
Poisson Ratio0.21
Refractive IndexN/A
Speed of Sound5940 m/s
Thermal Conductivity94 W/(m K)
Thermal Expansion4.9×10-6 K-1

Reactivity
Valence6
Electronegativity1.66
ElectronAffinity64.3 kJ/mol
Ionization Energies
652.9, 1590.6, 2987, 4743, 6702, 8744.9, 15455, 17820, 20190, 23580, 26130, 28750, 34230, 37066, 97510, 1.058×105, 1.143×105, 1.253×105, 1.347×105, 1.443×105, 1.577×105 kJ/mol

Health and Safety
Autoignition Point400 °C
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire Rating1
NFPA HazardsN/A
NFPA Health Rating2
NFPA Reactivity Rating1
RTECS NumberRTECSGB4200000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group6
Period4
Electron Configuration[Ar]3d54s1
ColorSilver
Discovery
1797 in France
Gas phaseN/A
CAS NumberCAS7440-47-3
CID NumberCID23976
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSGB4200000

Electrical properties
Electrical TypeConductor
Electrical Conductivity7.9×106 S/m
Resistivity1.3×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeAntiferromagnetic
Curie PointN/A
Mass Magnetic Susceptibility4.45×10-8
Molar Magnetic Susceptibility2.314×10-9
Volume Magnetic Susceptibility0.0003177

Abundances
% in Universe0.0015%
% in Sun0.002%
% in Meteorites0.3%
% in Earth's Crust0.014%
% in Oceans6×10-8%
% in Humans3×10-6%

Atomic dimensions and structure
Atomic Radius166 pm
Covalent Radius127 pm
Van der Waals RadiusN/A
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
291, 291, 291 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers7S3
Neutron Cross Section3.1
Neutron Mass Absorption0.0021
Known Isotopes
42Cr, 43Cr, 44Cr, 45Cr, 46Cr, 47Cr, 48Cr, 49Cr, 50Cr, 51Cr, 52Cr, 53Cr, 54Cr, 55Cr, 56Cr, 57Cr, 58Cr, 59Cr, 60Cr, 61Cr, 62Cr, 63Cr, 64Cr, 65Cr, 66Cr, 67Cr
Stable Isotopes
50Cr, 52Cr, 53Cr, 54Cr
Isotopic Abundances
50Cr4.345%
52Cr83.789%
53Cr9.501%
54Cr2.365%


Notes on the properties of Chromium:

Specific Heat: Value given for solid phase.

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

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