Rhenium

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Rhenium,  75Re
Rhenium single crystal bar and 1cm3 cube.jpg
General properties
Appearance sillery-white
Staundart atomic wecht (Ar, staundart) 186.207(1)
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 Gold 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
Group group 7
Period period 6
Element category   transition metal
Block d-block
Electron confeeguration [Xe] 4f14 5d5 6s2
Electrons per shell
2, 8, 18, 32, 13, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 3459 K ​(3186 °C, ​5767 °F)
Bylin pynt 5869 K ​(5596 °C, ​10105 °F)
Density (near r.t.) 21.02 g/cm3
when liquid (at m.p.) 18.9 g/cm3
Heat o fusion 60.43 kJ/mol
Heat o vapourisation 704 kJ/mol
Molar heat capacity 25.48 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 7, 6, 5, 4, 3, 2, 1, 0, -1
(mildly acidic oxide)
Electronegativity Pauling scale: 1.9
Ionisation energies
Atomic radius empirical: 137 pm
Covalent radius 151±7 pm
Color lines in a spectral range
Miscellanea
Creestal structurhexagonal close-packed (hcp)
Hexagonal close packed creestal structur for rhenium
Speed o soond thin rod 4700 m/s (at 20 °C)
Thermal expansion 6.2 µm/(m·K)
Thermal conductivity 48.0 W/(m·K)
Electrical resistivity 193 n Ω·m (at 20 °C)
Magnetic orderin paramagnetic[1]
Young's modulus 463 GPa
Shear modulus 178 GPa
Bouk modulus 370 GPa
Poisson ratio 0.30
Mohs haurdness 7.0
Vickers haurdness 2450 MPa
Brinell haurdness 1320 MPa
CAS Nummer 7440-15-5
History
Diskivery Masataka Ogawa (1908)
First isolation Masataka Ogawa (1908)
Named bi Walter 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
| references | in Wikidata

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.

References[eedit | eedit soorce]

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