Chemical element with atomic number 76Àdàkọ:SHORTDESC:Chemical element with atomic number 76
Osmium, 76Os |
Osmium |
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Pípè | /ˈɒzmiəm/ (OZ-mee-əm) |
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Ìhànsójú | silvery, blue cast |
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Ìwúwo átọ̀mù Ar, std(Os) | 190.23(3) |
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Osmium ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 76 |
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Ẹgbẹ́ | group 8 |
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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 5d6 6s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 14, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 3306 K (3033 °C, 5491 °F) |
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Ígbà ìhó | 5285 K (5012 °C, 9054 °F) |
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Kíki (near r.t.) | 22.59 g/cm3 |
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when liquid (at m.p.) | 20 g/cm3 |
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Heat of fusion | 57.85 kJ/mol |
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Heat of | 738 kJ/mol |
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Molar heat capacity | 24.7 J/(mol·K) |
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pressure P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k | at T (K) | 3160 | 3423 | 3751 | 4148 | 4638 | 5256 | |
Atomic properties |
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Oxidation states | −4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 2.2 |
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Atomic radius | empirical: 135 pm |
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Covalent radius | 144±4 pm |
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Spectral lines of osmium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | hexagonal |
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Speed of sound thin rod | 4940 m/s (at 20 °C) |
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Thermal expansion | 5.1 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 87.6 W/(m·K) |
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Electrical resistivity | 81.2 n Ω·m (at 0 °C) |
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Magnetic ordering | paramagnetic |
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Shear modulus | 222 GPa |
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Bulk modulus | 462 GPa |
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Poisson ratio | 0.25 |
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Mohs hardness | 7.0 |
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Brinell hardness | 3920 MPa |
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CAS Number | 7440-04-2 |
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Main isotopes of osmium |
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product | 184Os | 0.02% | >5.6×1013 y (not observed) | εε | 1.452 | 184W | 185Os | syn | 93.6 d | ε | 1.013 | 185Re | 186Os | 1.59% | 2.0×1015 y | α | 2.822 | 182W | 187Os | 1.96% | 187Os is stable with 111 neutrons | 188Os | 13.24% | 188Os is stable with 112 neutrons | 189Os | 16.15% | 189Os is stable with 113 neutrons | 190Os | 26.26% | 190Os is stable with 114 neutrons | 191Os | syn | 15.4 d | β− | 0.314 | 191Ir | 192Os | 40.78% | >9.8×1012 y (not observed) | β−β− | 0.414 | 192Pt | 193Os | syn | 30.11 d | β− | 1.141 | 193Ir | 194Os | syn | 6 y | β− | 0.097 | 194Ir | |
Àdàkọ:Category-inline | references |
References
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