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Tantalum (Ta)

Tantalum (Ta) is element 73 of the periodic table, a transition metal in period 6 and group 5. Its standard atomic weight is 180.94788, so one mole of tantalum atoms has a mass of 180.94788 g. At room temperature it is a solid; it melts at 3016.85 °C and boils at 5457.85 °C.

73 Ta Tantalum 180.94788

Period 6, group 5 · Transition metal

← Hf Hafnium W Tungsten →

Atomic number	73
Symbol	Ta
Standard atomic weight	180.94788
Molar mass	180.94788 g/mol
Category	Transition metal
Group	5
Period	6
Block	d-block
Electron configuration	[Xe] 6s² 4f¹⁴ 5d³
Oxidation states	+5
Electronegativity (Pauling)	1.5
Atomic radius (van der Waals)	217 pm
First ionisation energy	7.89 eV (761.3 kJ/mol)
Electron affinity	0.322 eV
State at room temperature	Solid
Melting point	3290 K (3016.85 °C)
Boiling point	5731 K (5457.85 °C)
Density	16.4 g/cm³
Discovered	1802

Group 5

V · Vanadium Nb · Niobium Db · Dubnium

Calculate with Tantalum

Molar mass of Ta Balance an equation Grams, moles and particles Whole periodic table

Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.