Osmium, 76 Os Osmium Pípè / ˈ ɒ z m i ə m / (OZ -mee-əm ) Ìhànsójú silvery, blue cast Ìwúwo átọ̀mù A r, std (Os) 190.23(3) Osmium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 76 Ẹgbẹ́ group 8 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f14 5d6 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 32, 14, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 3306 K (3033 °C, 5491 °F) Ígbà ìhó 5285 K (5012 °C, 9054 °F) Kíki (near r.t. ) 22.59 g/cm3 when liquid (at m.p. ) 20 g/cm3 Heat of fusion 57.85 kJ/mol Heat of 738 kJ/mol Molar heat capacity 24.7 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 3160 3423 3751 4148 4638 5256
Atomic properties Oxidation states −4, −2, −1, 0, +1, +2, +3, +4 , +5, +6, +7, +8 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 2.2 Atomic radius empirical: 135 pm Covalent radius 144±4 pm Color lines in a spectral range Spectral lines of osmium Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 4940 m/s (at 20 °C) Thermal expansion 5.1 µm/(m·K) (at 25 °C) Thermal conductivity 87.6 W/(m·K) Electrical resistivity 81.2 n Ω·m (at 0 °C) Magnetic ordering paramagnetic Shear modulus 222 GPa Bulk modulus 462 GPa Poisson ratio 0.25 Mohs hardness 7.0 Brinell hardness 3920 MPa CAS Number 7440-04-2 Main isotopes of osmium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 184 Os 0.02% >5.6×1013 y (not observed) εε 1.452 184 W 185 Os syn 93.6 d ε 1.013 185 Re 186 Os 1.59% 2.0×1015 y α 2.822 182 W 187 Os 1.96% 187 Os is stable with 111 neutrons 188 Os 13.24% 188 Os is stable with 112 neutrons 189 Os 16.15% 189 Os is stable with 113 neutrons 190 Os 26.26% 190 Os is stable with 114 neutrons 191 Os syn 15.4 d β− 0.314 191 Ir 192 Os 40.78% >9.8×1012 y (not observed) β− β− 0.414 192 Pt 193 Os syn 30.11 d β− 1.141 193 Ir 194 Os syn 6 y β− 0.097 194 Ir
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