Template:Infobox chromium

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Chromium, 24Cr
Template:Infobox element/symbol-to-top-image/alt
Chromium
Appearancesillery metallic
Standard atomic weight Ar, std(Cr)51.9961(6)[1]
Mass numberCr:
Chromium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
-

Cr

Mo
vanadiumchromiummanganese
Atomic nummer (Z)24
Groupgroup 6
Periodperiod 4
Blockd-block
Element category  Transeetion metal
Electron confeeguration[Ar] 3d5 4s1
Electrons per shell2, 8, 13, 1
Pheesical properties
Phase at STPsolit
Meltin pynt2180 K ​(1907 °C, ​3465 °F)
Bylin pynt2944 K ​(2671 °C, ​4840 °F)
Density (near r.t.)7.19 g/cm3
when liquid (at m.p.)6.3 g/cm3
Heat o fusion21.0 kJ/mol
Heat o vapourisation339.5 kJ/mol
Molar heat capacity23.35 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1656 1807 1991 2223 2530 2942
Atomic properties
Oxidation states−4, −2, −1, 0, +1, +2, +3, +4, +5, +6 (dependin on the oxidation state, an acidic, basic, or amphoteric oxide)
ElectronegativityPauling scale: 1.66
Ionisation energies
Atomic radiusempirical: 128 pm
Covalent radius139±5 pm
Colour lines in a spectral range
Spectral lines o chromium
Ither properties
Naitural occurrenceCr: Primordial
Creestal structurbody-centred cubic (bcc)
Body-centered cubic creestal structur for chromium
Speed o soond thin rod5940 m/s (at 20 °C)
Thermal expansion4.9 µm/(m·K) (at 25 °C)
Thermal conductivity93.9 W/(m·K)
Electrical resistivity125 n Ω·m (at 20 °C)
Magnetic orderinAFM (rather: SDW[2])
Young's modulus279 GPa
Shear modulus115 GPa
Bulk modulus160 GPa
Poisson ratio0.21
Mohs haurdness8.5
Vickers haurdness1060 MPa
Brinell haurdness1120 MPa
CAS Nummer7440-47-3
History
DiskiveryLouis Nicolas Vauquelin (1797)
First isolationLouis Nicolas Vauquelin (1798)
Main isotopes o chromium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
50Cr 4.345% >1.3×1018 y (β+β+) 50Ti
51Cr syn 27.7025 d ε 51V
γ -
52Cr 83.789% stable
53Cr 9.501% stable
54Cr 2.365% stable
Decay modes in parentheses are predictit, but hae nae yet been observed
| references
style="text-align:left"|
in calc from C diff report ref
C 1907
K 2180 2180 0
F 3465 3465 0
WD 3452 Fahrenheit Edit this at Wikidata
input C: 1907, K: 2180, F: 3465
comment
style="text-align:left"|
in calc from C diff report ref
C 2671
K 2944 2944 0
F 4840 4840 0
WD 4788 Fahrenheit Edit this at Wikidata
input C: 2671, K: 2944, F: 4840
comment

References

  1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. Fawcett, Eric (1988). "Spin-density-wave antiferromagnetism in chromium". Reviews of Modern Physics. 60: 209. Bibcode:1988RvMP...60..209F. doi:10.1103/RevModPhys.60.209.