Tantalum

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Tantalum,  73Ta
Tantalum single crystal and 1cm3 cube.jpg
Tantalum spectrum visible.png
Spectral lines o tantalum (400 nm - 700 nm)
General properties
Name, seembol tantalum, Ta
Pronunciation /ˈtæntələm/
TAN-təl-əm;
previously /tænˈtæliəm/
tan-TAL-ee-əm
Appearance gray blue
Tantalum in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)
Nb

Ta

Db
hafniumtantalumtungsten
Atomic nummer 73
Staundart atomic wicht (Ar) 180.94788
Element category   transeetion metal
Group, block group 5, d-block
Period period 6
Electron configuration [Xe] 4f14 5d3 6s2
per shell
2, 8, 18, 32, 11, 2
Pheesical properties
Phase solid
Meltin pynt 3290 K ​(3017 °C, ​5463 °F)
Boilin 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 732.8 kJ/mol
Molar heat capacity 25.36 J/(mol·K)
 pressure
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
Miscellanea
Crystal structur body-centered cubic (bcc)[1]
Body-centered cubic crystal structure 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
Bulk modulus 200 GPa
Poisson ratio 0.34
Mohs haurdness 6.5
Vickers haurdness 873 MPa
Brinell haurdness 800 MPa
CAS Registry Nummer 7440-25-7
History
Discovery Anders Gustaf Ekeberg (1802)
Recognized as a distinct element bi Heinrich Rose (1844)
Maist stable isotopes
Main article: Isotopes o tantalum
iso NA hauf-life DM DE (MeV) DP
177Ta syn 56.56 h ε 1.166 177Hf
178Ta syn 2.36 h ε 1.910 178Hf
179Ta syn 1.82 y ε 0.110 179Hf
180Ta syn 8.125 h 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) 1.5259 177Lu
182Ta syn 114.43 d β 1.814 182W
183Ta syn 5.1 d β 1.070 183W
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

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 such 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. 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. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
  3. Euripides, Orestes