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Tantalum, 73Ta
Tantalum single crystal and 1cm3 cube.jpg
Tantalum
Pronunciation /ˈtæntələm/ (TAN-təl-əm)
Appearance gray blue
Standard atomic weight Ar, std(Ta) 180.94788(2)
Tantalum in the periodic table
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Mercury (element) Thallium Lead 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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Nb

Ta

Db
hafniumtantalumtungsten
Atomic number (Z) 73
Group group 5
Period period 6
Block   d
Electron configuration [Xe] 4f14 5d3 6s2
Electrons per shell 2, 8, 18, 32, 11, 2
Physical properties
Phase at STP solid
Melting point 3290 K ​(3017 °C, ​5463 °F)
Boiling point 5731 K ​(5458 °C, ​9856 °F)
Density (near r.t.) 16.69 g/cm3
when liquid (at m.p.) 15 g/cm3
Heat of fusion 36.57 kJ/mol
Heat of vaporization 753 kJ/mol
Molar heat capacity 25.36 J/(mol·K)
Vapor 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 −3, −1, +1, +2, +3, +4, +5 (a mildly acidic oxide)
Electronegativity Pauling scale: 1.5
Ionization energies
  • 1st: 761 kJ/mol
  • 2nd: 1500 kJ/mol
Atomic radius empirical: 146 pm
Covalent radius 170±8 pm
Color lines in a spectral range
Spectral lines of tantalum
Other properties
Natural occurrence primordial
Crystal structure body-centered cubic (bcc)
Body-centered cubic crystal structure for tantalum

α-Ta
Crystal structure ​tetragonal
Tetragonal crystal structure for tantalum

β-Ta
Speed of sound 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 nΩ⋅m (at 20 °C)
Magnetic ordering paramagnetic
Molar magnetic susceptibility +154.0·10−6 cm3/mol (293 K)
Young's modulus 186 GPa
Shear modulus 69 GPa
Bulk modulus 200 GPa
Poisson ratio 0.34
Mohs hardness 6.5
Vickers hardness 870–1200 MPa
Brinell hardness 440–3430 MPa
CAS Number 7440-25-7
History
Discovery Anders Gustaf Ekeberg (1802)
Recognized as a distinct element by Heinrich Rose (1844)
Main isotopes of tantalum
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
177Ta syn 56.56 h ε 177Hf
178Ta syn 2.36 h ε 178Hf
179Ta syn 1.82 y ε 179Hf
180Ta syn 8.125 h ε 180Hf
β 180W
180mTa 0.012% stable
181Ta 99.988% stable
182Ta syn 114.43 d β 182W
183Ta syn 5.1 d β 183W
Ta,73
Tantalum in a glass tube

Tantalum is a chemical element. Tantalum was named tantalium. It has the chemical symbol Ta. It has the atomic number 73. It is a rare metal. It is hard and blue-gray. In chemistry it is placed in a group of metal elements named the transition metals.

Tantalum does not easily corrode. It is found in the mineral tantalite.

Images for kids

See also

Kids robot.svg In Spanish: Tántalo (elemento) para niños

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