Rhodium

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Rhodium,  45Rh
Rhodium powder pressed melted.jpg
General properties
Appearance silvery white metallic
Staundart atomic wecht (Ar, staundart) 102.90550(2)
Rhodium 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
Co

Rh

Ir
rutheniumrhodiumpalladium
Atomic nummer (Z) 45
Group group 9
Period period 5
Element category   transition metal
Block d-block
Electron confeeguration [Kr] 5s1 4d8
Electrons per shell
2, 8, 18, 16, 1
Pheesical properties
Phase (at STP) solit
Meltin pynt 2237 K ​(1964 °C, ​3567 °F)
Bylin pynt 3968 K ​(3695 °C, ​6683 °F)
Density (near r.t.) 12.41 g/cm3
when liquid (at m.p.) 10.7 g/cm3
Heat o fusion 26.59 kJ/mol
Heat o vapourisation 494 kJ/mol
Molar heat capacity 24.98 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2288 2496 2749 3063 3405 3997
Atomic properties
Oxidation states 6, 5, 4, 3, 2, 1[1], -1
(amphoteric oxide)
Electronegativity Pauling scale: 2.28
Atomic radius empirical: 134 pm
Covalent radius 142±7 pm
Color lines in a spectral range
Miscellanea
Creestal structurface-centred cubic (fcc)
Face-centered cubic creestal structur for rhodium
Speed o soond thin rod 4700 m/s (at 20 °C)
Thermal expansion 8.2 µm/(m·K) (at 25 °C)
Thermal conductivity 150 W/(m·K)
Electrical resistivity 43.3 n Ω·m (at 0 °C)
Magnetic orderin paramagnetic[2]
Young's modulus 380 GPa
Shear modulus 150 GPa
Bouk modulus 275 GPa
Poisson ratio 0.26
Mohs haurdness 6.0
Vickers haurdness 1246 MPa
Brinell haurdness 1100 MPa
CAS Nummer 7440-16-6
History
Diskivery William Hyde Wollaston (1804)
First isolation William Hyde Wollaston (1804)
Main isotopes o rhodium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
99Rh syn 16.1 d ε 99Ru
γ - 101mRh syn 4.34 d ε 101Ru
IT 101Rh
γ -
101Rh syn 3.3 y ε 101Ru
γ -
102mRh syn 2.9 y ε 102Ru
γ -
102Rh syn 207 d ε - 102Ru
β+ 0.826, 1.301 102Ru
β 1.151 102Pd
γ 0.475, 0.628 -
103Rh 100% - (SF)
105Rh syn 35.36 h β 105Pd
γ -
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Rhodium is a chemical element that is a rare, sillery-white, haird, an chemically inert transeetion metal an a member o the platinum group. It haes the chemical seembol Rh an atomic nummer 45. It is componed o anly ane naiturally-occurrin isotope, 103Rh. Naiturally occurrin rhodium is uisually foond as the free metal, alloyed wi seemilar metals, an rarely as a chemical compoond in minerals sic as bowieite an rhodplumsite. It is ane o the rarest an maist valuable precious metals.

References[eedit | eedit soorce]

  1. "Rhodium: rhodium(I) fluoride compound data". OpenMOPAC.net. Retrieved 2007-12-10. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.