Tantalum

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Tantalum,  73Ta
Tantalum single crystal and 1cm3 cube.jpg
General properties
Appearancegray blue
Staundart atomic wecht (Ar, staundart)180.94788(2)[1]
Tantalum 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
Nb

Ta

Db
hafniumtantalumtungsten
Atomic nummer (Z)73
Groupgroup 5
Periodperiod 6
Element category  transition metal
Blockd-block
Electron confeeguration[Xe] 4f14 5d3 6s2
Electrons per shell
2, 8, 18, 32, 11, 2
Pheesical properties
Phase (at STP)solit
Meltin pynt3290 K ​(3017 °C, ​5463 °F)
Bylin pynt5731 K ​(5458 °C, ​9856 °F)
Density (near r.t.)16.69 g/cm3
when liquid (at m.p.)15 g/cm3
Heat o fusion36.57 kJ/mol
Heat o vapourisation732.8 kJ/mol
Molar heat capacity25.36 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 3297 3597 3957 4395 4939 5634
Atomic properties
Oxidation states5, 4, 3, 2, -1 (mildly acidic oxide)
ElectronegativityPauling scale: 1.5
Atomic radiusempirical: 146 pm
Covalent radius170±8 pm
Coloyr lines in a spectral range
Spectral lines o Tantalum
Miscellanea
Creestal structurbody-centred cubic (bcc)[2]
Body-centered cubic creestal structur for tantalum

α-Ta
Speed o soond thin rod3400 m/s (at 20 °C)
Thermal expansion6.3 µm/(m·K) (at 25 °C)
Thermal conductivity57.5 W/(m·K)
Electrical resistivity131 n Ω·m (at 20 °C)
Magnetic orderinparamagnetic[3]
Young's modulus186 GPa
Shear modulus69 GPa
Bouk modulus200 GPa
Poisson ratio0.34
Mohs haurdness6.5
Vickers haurdness873 MPa
Brinell haurdness800 MPa
CAS Nummer7440-25-7
History
DiskiveryAnders Gustaf Ekeberg (1802)
Recognized as a distinct element biHeinrich Rose (1844)
Main isotopes o tantalum
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
177Ta syn 56.56 o ε 177Hf
178Ta syn 2.36 o ε 178Hf
179Ta syn 1.82 y ε 179Hf
180Ta syn 8.125 o ε 180Hf
β 180W
180mTa 0.012% >1.2×1015 y (ε) 180Hf
(β) 180W
(IT) 180Ta
(α) 176Lu
181Ta 99.988% - (α) 177Lu
182Ta syn 114.43 d β 182W
183Ta syn 5.1 d β 183W
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Tantalum is a chemical element wi the seembol Ta an atomic nummer 73. Previously kent as tantalium, its name comes frae Tantalus, a character frae Greek meethology.[4] Tantalum is a rare, haird, blue-gray, lustrous transeetion metal that is heichly corrosion-resistant. It is pairt o the refractory metals group, which are widely uised as minor components in alloys. The chemical inertness o tantalum maks it a valuable substance for laboratory equipment an a substitute for platinum, but its main uise the day is in tantalum capacitors in electronic equipment sic as mobile phones, DVD players, video gemme seestems an computers. Tantalum, always thegither wi the chemically seemilar niobium, occurs in the minerals tantalite, columbite an coltan (a mix o columbite an tantalite).

References[eedit | eedit soorce]

  1. Meija, J.; 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. 2.0 2.1 Moseley, P. T.; Seabrook, C. J. (15 May 1973). "The crystal structure of β-tantalum". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 29 (5): 1170–1171. doi:10.1107/S0567740873004140. 
  3. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
  4. Euripides, Orestes