Tóríọ̀m tabi Thorium je apilese kemika to ni ami-idamo Th ati nomba atomu 90.
Thorium, 90ThThorium |
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Pípè | /ˈθɔːriəm/ (THOR-ee-əm) |
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Ìhànsójú | silvery white |
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Ìwúwo átọ̀mù Ar, std(Th) | 232.0377(4)[1] |
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Thorium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 90 |
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Ẹgbẹ́ | group n/a |
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Àyè | àyè 7 |
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Àdìpọ̀ | Àdìpọ̀-f |
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Ẹ̀ka ẹ́límẹ́ntì | Actinide |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Rn] 6d2 7s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 18, 10, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 2115 K (1842 °C, 3348 °F) |
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Ígbà ìhó | 5061 K (4788 °C, 8650 °F) |
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Kíki (near r.t.) | 11.7 g/cm3 |
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Heat of fusion | 13.81 kJ/mol |
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Heat of | 514 kJ/mol |
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Molar heat capacity | 26.230 J/(mol·K) |
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pressureP (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
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at T (K) | 2633 | 2907 | 3248 | 3683 | 4259 | 5055 |
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Atomic properties |
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Oxidation states | +1, +2, +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.3 |
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Atomic radius | empirical: 179 pm |
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Covalent radius | 206±6 pm |
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Spectral lines of thorium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (fcc) |
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Speed of sound thin rod | 2490 m/s (at 20 °C) |
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Thermal expansion | 11.0 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 54.0 W/(m·K) |
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Electrical resistivity | 147 n Ω·m (at 0 °C) |
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Magnetic ordering | paramagnetic[2] |
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Young's modulus | 79 GPa |
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Shear modulus | 31 GPa |
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Bulk modulus | 54 GPa |
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Poisson ratio | 0.27 |
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Mohs hardness | 3.0 |
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Vickers hardness | 350 MPa |
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Brinell hardness | 400 MPa |
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CAS Number | 7440-29-1 |
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Main isotopes of thorium |
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
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228Th | trace | 1.9116 years | α | 5.520 | 224Ra | 229Th | syn | 7340 years | α | 5.168 | 225Ra | 230Th | trace | 75380 years | α | 4.770 | 226Ra | 231Th | trace | 25.5 hours | β | 0.39 | 231Pa | 232Th | 100% | 1.405×1010 years | α | 4.083 | 228Ra | 234Th | trace | 24.1 days | β | 0.27 | 234Pa |
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Àdàkọ:Category-inline | references |
Thorium je onide alagbararadio to sele ladanida.
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