| Tantalum |
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73Ta |
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| Panagway |
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gray blue
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| Kinatibuk-ang mga kinaiya |
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| Ngalan,simbolo,kaiphan | tantalum, Ta, 73 |
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| Paglitok | /ˈtæntələm/
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-təl-əm]];
previously/tænˈtæliəm/
[[Help:Pronunciation respelling key|tan-Plantilya:Smallcaps all-ee-əm]] |
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| Kategoriyang elemento | puthaw nga transisyon |
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| Group,period,block | 5, 6,d |
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| Gibug-aton sa atomo | 180.94788 |
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| Kontorno sa elektron | [Xe] 4f14 5d3 6s2
2, 8, 18, 32, 11, 2 Electron shells of tantalum(2, 8, 18, 32, 11, 2) |
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| History |
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| Pagkadiskobre | Anders Gustaf Ekeberg(1802) |
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| Recognized as a distinctelement by | Heinrich Rose (1844) |
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| Physical properties |
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| Phase | magahi |
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| Density (nearr.t.) | 16.69 g·cm−3 |
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| Liquiddensity atm.p. | 15 g·cm−3 |
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| Melting point | 3290 K, 3017 °C, 5463 °F |
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| Boiling point | 5731 K, 5458 °C, 9856 °F |
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| Heat of fusion | 36.57kJ·mol−1 |
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| Heat of vaporization | 732.8 kJ·mol−1 |
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| Molar heat capacity | 25.36 J·mol−1·K−1 |
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| Vapor pressure |
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| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k | | at T (K) | 3297 | 3597 | 3957 | 4395 | 4939 | 5634 |
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| Atomic properties |
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| Oxidation states | 5, 4, 3, 2, -1 (mildlyacidic oxide) |
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| Electronegativity | 1.5 (Pauling scale) |
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| Ionization energies | 1st: 761 kJ·mol−1 |
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| 2nd: 1500 kJ·mol−1 |
| Atomic radius | 146pm |
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| Covalent radius | 170±8 pm |
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| Miscellanea |
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| Crystal structure | body-centered cubic[1]
α-Ta |
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| tetragonal[1]
β-Ta |
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| Magnetic ordering | paramagnetic[2] |
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| Electrical resistivity | (20 °C) 131 nΩ·m |
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| Thermal conductivity | 57.5 W·m−1·K−1 |
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| Thermal expansion | (25 °C) 6.3 µm·m−1·K−1 |
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| Speed of sound (thin rod) | (20 °C) 3400 m·s−1 |
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| Young's modulus | 186 GPa |
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| Shear modulus | 69 GPa |
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| Bulk modulus | 200 GPa |
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| Poisson ratio | 0.34 |
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| Mohs hardness | 6.5 |
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| Vickers hardness | 873 MPa |
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| Brinell hardness | 800 MPa |
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| CAS registry number | 7440-25-7 |
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| Most stable isotopes |
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| Main article:Isotopes of tantalum |
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| ·r |
