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Tantalum, 73 Ta File:Tantalum single crystal and 1cm3 cube.jpg Tantalum Pronunciation (Template:Respell ) Appearance gray blue Standard atomic weight A r, std (Ta) Template:Val [1] Tantalum in the periodic table
Atomic number (Z ) 73 Group group 5 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 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, 0, +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 Spectral lines of tantalumOther properties Natural occurrence primordial Crystal structure body-centered cubic (bcc)[2] α-Ta Crystal structure tetragonal [2] 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 [3] Magnetic susceptibility +154.0·10−6 cm3 /mol (293 K)[4] 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
16x16px Category: Tantalum | references
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References
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