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| Tantalum |
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| Pípè | /ˈtæntələm/ (TAN-təl-əm) |
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| Ìhànsójú | gray blue |
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| Ìwúwo átọ̀mù Ar, std(Ta) | 180.94788(2)[1] |
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| Tantalum ní orí tábìlì àyè |
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| Nọ́mbà átọ̀mù (Z) | 73 |
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| Ẹgbẹ́ | group 5 |
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| Àyè | àyè 6 |
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| Àdìpọ̀ | Àdìpọ̀-d |
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| Ẹ̀ka ẹ́límẹ́ntì | Transition metal |
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| Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 4f14 5d3 6s2 |
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| Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 11, 2 |
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| Àwọn ohun ìní ara |
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| Ìfarahàn at STP | solid |
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| Ìgbà ìyọ́ | 3290 K (3017 °C, 5463 °F) |
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| Ígbà ìhó | 5731 K (5458 °C, 9856 °F) |
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| Kíki (near r.t.) | 16.69 g/cm3 |
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| when liquid (at m.p.) | 15 g/cm3 |
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| Heat of fusion | 36.57 kJ/mol |
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| Heat of | 732.8 kJ/mol |
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| Molar heat capacity | 25.36 J/(mol·K) |
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pressure| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
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| at T (K) | 3297 | 3597 | 3957 | 4395 | 4939 | 5634 |
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| Atomic properties |
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| Oxidation states | −3, −1, +1, +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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| Electronegativity | Pauling scale: 1.5 |
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| Atomic radius | empirical: 146 pm |
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| Covalent radius | 170±8 pm |
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 Color lines in a spectral rangeSpectral lines of tantalum |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | (bcc) |
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| Speed of sound thin rod | 3400 m/s (at 20 °C) |
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| Thermal expansion | 6.3 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 57.5 W/(m·K) |
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| Electrical resistivity | 131 n Ω·m (at 20 °C) |
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| Magnetic ordering | paramagnetic[2] |
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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 Number | 7440-25-7 |
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| Main isotopes of tantalum |
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| Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
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| 177Ta | syn | 56.56 h | ε | 1.166 | 177Hf | | 178Ta | syn | 2.36 h | ε | 1.910 | 178Hf | | 179Ta | syn | 1.82 a | ε | 0.110 | 179Hf | | 180Ta | syn | 8.125 h | ε | 0.854 | 180Hf | | β− | 0.708 | 180W | | 180mTa | 0.012% | >1.2×1015 y
(not observed) | ε | 0.929 | 180Hf | | β− | 0.783 | 180W | | IT | 0.075 | 180Ta | | 181Ta | 99.988% | 181Ta is stable with 108 neutrons | | 182Ta | syn | 114.43 d | β− | 1.814 | 182W | | 183Ta | syn | 5.1 d | β− | 1.070 | 183W |
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Àdàkọ:Category-inline
| references |
