Protactinium |
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Pípè | /ˌproʊtækˈtɪniəm/ (PROH-tak-TIN-ee-əm) |
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Ìhànsójú | bright, silvery metallic luster |
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Ìwúwo átọ̀mù Ar, std(Pa) | 231.03588(1)[1] |
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Protactinium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 91 |
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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] 5f2 6d1 7s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 20, 9, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1841 K (1568 °C, 2854 °F) |
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Ígbà ìhó | ? 4300 K (? 4027 °C, ? 7280 °F) |
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Kíki (near r.t.) | 15.37 g/cm3 |
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Heat of fusion | 12.34 kJ/mol |
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Heat of | 481 kJ/mol |
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Atomic properties |
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Oxidation states | +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: 163 pm |
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Covalent radius | 200 pm |
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Spectral lines of protactinium |
Other properties |
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Natural occurrence | from decay |
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Crystal structure | orthorhombic |
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Thermal conductivity | 47 W/(m·K) |
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Electrical resistivity | 177 n Ω·m (at 0 °C) |
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Magnetic ordering | paramagnetic[2] |
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CAS Number | 7440-13-3 |
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Main isotopes of protactinium |
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Àdàkọ:Category-inline | references |