Àktíníọ̀m tabi Actinium je is a radioactive apilese kemika alagbararadio to ni ami-idamo Ac ati nomba atomu 89, to je wiwari ni odun 1899.
Actinium, 89AcActinium |
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Pípè | /ækˈtɪniəm/ (ak-TIN-ee-əm) |
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Ìhànsójú | silvery |
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nọ́mbà ìsújọ | [227] |
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Actinium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 89 |
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Ẹgbẹ́ | group 3 |
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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] 6d1 7s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 18, 9, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | (circa) 1323 K (1050 °C, 1922 °F) |
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Ígbà ìhó | 3471 K (3198 °C, 5788 °F) |
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Kíki (near r.t.) | 10 g/cm3 |
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Heat of fusion | 14 kJ/mol |
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Heat of | 400 kJ/mol |
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Molar heat capacity | 27.2 J/(mol·K) |
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Atomic properties |
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Oxidation states | +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.1 |
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Covalent radius | 215 pm |
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Spectral lines of actinium |
Other properties |
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Natural occurrence | from decay |
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Crystal structure | (fcc) |
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Thermal conductivity | 12 W/(m·K) |
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Magnetic ordering | no data |
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CAS Number | 7440-34-8 |
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Main isotopes of actinium |
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
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225Ac | syn | 10 days | α | 5.935 | 221Fr | 226Ac | syn | 29.37 hours | β− | 1.117 | 226Th | ε | 0.640 | 226Ra | α | 5.536 | 222Fr | 227Ac | 100% | 21.773 years | β− | 0.045 | 227Th | α | 5.042 | 223Fr |
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Àdàkọ:Category-inline | references |
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