Tantalum

Tantalum, ₇₃Ta

Tantalum
Pípè	/ˈtæntələm/ ​(TAN-təl-əm)
Ìhànsójú	gray blue
Ìwúwo átọ̀mù Ar, std(Ta)	180.94788(2)
Tantalum ní orí tábìlì àyè
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 hafnium ← tantalum → tungsten
Nọ́mbà átọ̀mù (Z)	73
Ẹgbẹ́	group 5
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f14 5d3 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 11, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	3290 K ​(3017 °C, ​5463 °F)
Ígbà ìhó	5731 K ​(5458 °C, ​9856 °F)
Kíki (near r.t.)	16.69 g/cm3
when liquid (at m.p.)	15 g/cm3
Heat of fusion	36.57 kJ/mol
Heat of	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	−3, −1, +1, +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.5
Atomic radius	empirical: 146 pm
Covalent radius	170±8 pm
Spectral lines of tantalum
Other properties
Natural occurrence	primordial
Crystal structure	​(bcc)
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 n Ω·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	186 GPa
Shear modulus	69 GPa
Bulk modulus	200 GPa
Poisson ratio	0.34
Mohs hardness	6.5
Vickers hardness	873 MPa
Brinell hardness	800 MPa
CAS Number	7440-25-7
Main isotopes of tantalum
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 177Ta syn 56.56 h ε 1.166 177Hf 178Ta syn 2.36 h ε 1.910 178Hf 179Ta syn 1.82 a ε 0.110 179Hf 180Ta syn 8.125 h ε 0.854 180Hf β− 0.708 180W 180mTa 0.012% >1.2×1015 y (not observed) ε 0.929 180Hf β− 0.783 180W IT 0.075 180Ta 181Ta 99.988% 181Ta is stable with 108 neutrons 182Ta syn 114.43 d β− 1.814 182W 183Ta syn 5.1 d β− 1.070 183W