Tantalum

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

Ta

Db
hafniumtantalumtungsten
Atomic nummer (Z) 73
Group group 5
Period period 6
Element category   transeetion metal
Block d-block
Electron confeeguration [Xe] 4f14 5d3 6s2
Electrons per shell
2, 8, 18, 32, 11, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 3290 K ​(3017 °C, ​5463 °F)
Bylin pynt 5731 K ​(5458 °C, ​9856 °F)
Density (near r.t.) 16.69 g/cm3
when liquid (at m.p.) 15 g/cm3
Heat o fusion 36.57 kJ/mol
Heat o vapourisation 732.8 kJ/mol
Molar heat capacity 25.36 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 states 5, 4, 3, 2, -1 (mildly acidic oxide)
Electronegativity Pauling scale: 1.5
Atomic radius empirical: 146 pm
Covalent radius 170±8 pm
Color lines in a spectral range
Miscellanea
Crestal structur body-centred cubic (bcc)[1]
Body-centered cubic creestal structur for tantalum

α-Ta
Speed o soond thin rod 3400 m/s (at 20 °C)
Thermal expansion 6.3 µm/(m·K) (at 25 °C)
Thermal conductivity 57.5 W/(m·K)
Electrical resistivity 131 n Ω·m (at 20 °C)
Magnetic orderin paramagnetic[2]
Young's modulus 186 GPa
Shear modulus 69 GPa
Bouk modulus 200 GPa
Poisson ratio 0.34
Mohs haurdness 6.5
Vickers haurdness 873 MPa
Brinell haurdness 800 MPa
CAS Nummer 7440-25-7
History
Diskivery Anders Gustaf Ekeberg (1802)
Recognized as a distinct element bi Heinrich 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 0.854 180Hf
β 0.708 180W
180mTa 0.012% >1.2×1015 y (ε) 0.929 180Hf
(β) 0.783 180W
(IT) 0.075 180Ta
(α) 2.103 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.[3] 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. 1.0 1.1 Moseley, P. T.; Seabrook, C. J. (15 Mey 1973). "The crystal structure of β-tantalum". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 29 (5): 1170–1171. doi:10.1107/S0567740873004140. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
  3. Euripides, Orestes