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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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Spectral 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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Àdàkọ:Category-inline | references |