Template:Infobox chromium

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24 vanadiumchromiummanganese
-

Cr

Mo
General
Name, symbol, number chromium, Cr, 24
Chemical seriestransition metals
Group, period, block 64, d
Appearancesilvery metallic
Standard atomic weight 51.9961(6) g·mol−1
Electron configuration [Ar] 3d5 4s1
Electrons per shell 2, 8, 13, 1
Physical properties
Phasesolid
Density (near r.t.)7.15 g·cm−3
Liquid density at m.p.6.3 g·cm−3
Melting point2180 K
(1907 °C, 3465 °F)
Boiling point2944 K
(2671 °C, 4840 °F)
Heat of fusion21.0 kJ·mol−1
Heat of vaporization339.5 kJ·mol−1
Heat capacity(25 °C) 23.35 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K 1656 1807 1991 2223 2530 2942
Atomic properties
Crystal structurecubic body centered
Oxidation states6, 4, 3, 2
(strongly acidic oxide)
Electronegativity1.66 (Pauling scale)
Ionization energies
(more)
1st: 652.9 kJ·mol−1
2nd: 1590.6 kJ·mol−1
3rd: 2987 kJ·mol−1
Atomic radius140 pm
Atomic radius (calc.)166 pm
Covalent radius127 pm
Miscellaneous
Magnetic orderingAFM (rather: SDW)
Electrical resistivity(20 °C) 125 nΩ·m
Thermal conductivity(300 K) 93.9 W·m−1·K−1
Thermal expansion(25 °C) 4.9 µm·m−1·K−1
Speed of sound (thin rod)(20 °C) 5940 m/s
Young's modulus279 GPa
Shear modulus115 GPa
Bulk modulus160 GPa
Poisson ratio0.21
Mohs hardness8.5
Vickers hardness1060 MPa
Brinell hardness1120 MPa
CAS registry number7440-47-3
Selected isotopes
Main article: Isotopes of chromium
iso NA half-life DM DE (MeV) DP
50Cr 4.345% > 1.8×1017y εε - 50Ti
51Cr syn 27.7025 d ε - 51V
γ 0.320 -
52Cr 83.789% Cr is stable with 28 neutrons
53Cr 9.501% Cr is stable with 29 neutrons
54Cr 2.365% Cr is stable with 30 neutrons
References
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