Rhenium is a chemical element wi the seembol Re an atomic nummer 75. It is a sillery-white, hivy, third-row transeetion metal in group 7 o the periodic table. Wi an estimatit average concentration o 1 pairt per billion (ppb), rhenium is ane o the rarest elements in the Yird's crust. The free element haes the third-heichest meltin pynt an heichest boilin pynt o ony element. Rhenium resembles manganese chemically an is obtained as a bi-product o molybdenum an copper ore's extraction an refinement. Rhenium shaws in its compoonds a wide variety o oxidation states rangin frae −1 tae +7.

Rhenium, 75Re
Template:Infobox element/symbol-to-top-image/alt
Rhenium
Pronunciation/ˈrniəm/ (REE-nee-əm)
Appearancesillery-white
Standard atomic weight Ar, std(Re)186.207(1)[1]
Mass numberRe:
Rhenium 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
Tc

Re

Bh
tungstenrheniumosmium
Atomic nummer (Z)75
Groupgroup 7
Periodperiod 6
Blockd-block
Element category  Transeetion metal
Electron confeeguration[Xe] 4f14 5d5 6s2
Electrons per shell2, 8, 18, 32, 13, 2
Pheesical properties
Phase at STPsolit
Meltin pynt3459 K ​(3186 °C, ​5767 °F)
Bylin pynt5869 K ​(5596 °C, ​10105 °F)
Density (near r.t.)21.02 g/cm3
when liquid (at m.p.)18.9 g/cm3
Heat o fusion60.43 kJ/mol
Heat o vapourisation704 kJ/mol
Molar heat capacity25.48 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 3303 3614 4009 4500 5127 5954
Atomic properties
Oxidation states−3, −1, 0, +1, +2, +3, +4, +5, +6, +7 (a mildly acidic oxide)
ElectronegativityPauling scale: 1.9
Ionisation energies
Atomic radiusempirical: 137 pm
Covalent radius151±7 pm
Colour lines in a spectral range
Spectral lines o rhenium
Ither properties
Naitural occurrenceRe: Primordial
Creestal structurhexagonal close-packed (hcp)
Hexagonal close packed creestal structur for rhenium
Speed o soond thin rod4700 m/s (at 20 °C)
Thermal expansion6.2 µm/(m·K)
Thermal conductivity48.0 W/(m·K)
Electrical resistivity193 n Ω·m (at 20 °C)
Magnetic orderinparamagnetic[2]
Young's modulus463 GPa
Shear modulus178 GPa
Bulk modulus370 GPa
Poisson ratio0.30
Mohs haurdness7.0
Vickers haurdness2450 MPa
Brinell haurdness1320 MPa
CAS Nummer7440-15-5
History
DiskiveryMasataka Ogawa (1908)
First isolationMasataka Ogawa (1908)
Named byWalter Noddack, Ida Noddack, Otto Berg (1922)
Main isotopes o rhenium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
185Re 37.4% - (α) 181Ta
187Re 62.6% 4.12×1010 y α 183Ta
β 187Os
Decay modes in parentheses are predictit, but hae nae yet been observed
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ReferencesEedit

  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. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.