Template:Infobox tantalum

Tantalum, ₇₃Ta

Tantalum
Pronunciation	/ˈtæntələm/ ​(TAN-təl-əm)
Appearance	gray blue
Standard atomic weight Ar, std(Ta)	7002180947880000000♠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 Gowd 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 hafnium ← tantalum → tungsten
Atomic nummer (Z)	73
Group	group 5
Period	period 6
Block	d-block
Element category	Transeetion metal
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	−3, −1, +1, +2, +3, +4, +5 (a mildly acidic oxide)
Electronegativity	Pauling scale: 1.5
Atomic radius	empirical: 146 pm
Covalent radius	170±8 pm
Colour lines in a spectral range Spectral lines o tantalum
Ither properties
Naitural occurrence	primordial
Creestal structur	​body-centred cubic (bcc) 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
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 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 180Hf β− 180W 180mTa 0.012% >1.2×1015 y (ε) 180Hf (β−) 180W (IT) 180Ta (α) 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

style="text-align:left"| data m.p. cat
	in	calc from C	diff	report	ref
C	3017	—	—
K	3290	3290	0
F	5463	5463	0
WD	5425 !5425 Fahrenheit
input	C: 3017, K: 3290, F: 5463
comment

style="text-align:left"| data b.p. cat
	in	calc from C	diff	report	ref
C	5458	—	—
K	5731	5731	0
F	9856	9856	0
WD	9797 !9797 Fahrenheit
input	C: 5458, K: 5731, F: 9856
comment

References

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