మూస:Infobox tantalum

టాంటలం, ₀₀Ta

టాంటలం
Pronunciation	/ˈtæntələm/ ​(TAN-təl-əm)
Appearance	gray blue
Standard atomic weight Ar°(Ta)
	180.94788±0.00002 180.95±0.01 (abridged)
టాంటలం 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Nb ↑ Ta ↓ Db హాఫ్నియం ← టాంటలం → టంగ్‌స్టన్
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	d-block
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	732.8 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, 0, +1, +2, +3, +4, +5 (a mildly acidic oxide)
Electronegativity	Pauling scale: 1.5
Atomic radius	empirical: 146 pm
Covalent radius	170±8 pm
Spectral lines of టాంటలం
Other properties
Natural occurrence	primordial
Crystal structure	​body-centered cubic (bcc) α-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 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
History
Discovery	ఆండర్స్ గుస్టాఫ్ ఎకెబెర్గ్ (1802)
ఒక మూలకంగా గుర్తించినది	హీన్రిచ్ రోస్ (1844)
Isotopes of టాంటలం

References

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