Polonium (pípè /pɵˈloʊniəm/, po-LOH-nee-əm) je ipilese kemika pelu ami-idamo Po ati nomba atomu 84, ti Marie Skłodowska-Curie ati Pierre Curie se awari ni 1898.
Polonium, 84PoPolonium |
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Pípè | /pəˈləʊniəm/ (pə-LOH-nee-əm) |
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Ìhànsójú | silvery |
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nọ́mbà ìsújọ | [209] |
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Polonium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 84 |
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Ẹgbẹ́ | group 16 (chalcogens) |
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Àyè | àyè 6 |
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Àdìpọ̀ | Àdìpọ̀-p |
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Ẹ̀ka ẹ́límẹ́ntì | Post-transition metal |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 4f14 5d10 6s2 6p4 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 18, 6 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 527 K (254 °C, 489 °F) |
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Ígbà ìhó | 1235 K (962 °C, 1764 °F) |
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Kíki (near r.t.) | (alpha) 9.196 g/cm3 (beta) 9.398 g/cm3 |
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Heat of fusion | ca. 13 kJ/mol |
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Heat of | 102.91 kJ/mol |
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Molar heat capacity | 26.4 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) | | | | (846) | 1003 | 1236 |
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Atomic properties |
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Oxidation states | −2, +2, +4, +5,[1] +6 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 2.0 |
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Atomic radius | empirical: 168 pm |
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Covalent radius | 140±4 pm |
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Van der Waals radius | 197 pm |
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Color lines in a spectral rangeSpectral lines of polonium |
Other properties |
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Natural occurrence | from decay |
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Crystal structure | cubic |
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Thermal expansion | 23.5 µm/(m·K) (at 25 °C) |
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Thermal conductivity | ? 20 W/(m·K) |
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Electrical resistivity | (α) 0.40 µ Ω·m (at 0 °C) |
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Magnetic ordering | nonmagnetic |
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CAS Number | 7440-08-6 |
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Main isotopes of polonium |
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
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208Po | syn | 2.898 y | α | 5.215 | 204Pb | ε, β+ | 1.401 | 208Bi | 209Po | syn | 103 y | α | 4.979 | 205Pb | ε, β+ | 1.893 | 209Bi | 210Po | trace | 138.376 d | α | 5.307 | 206Pb |
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Àdàkọ:Category-inline | references |
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