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76
Os
190.2
Osmium |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Osmium | Symbol: Os |
| Group: Trans. Met. | Atomic weight: 190.2 |
| Density @ 293 K: 22.40 g/cm3 | Atomic volume: 8.49 cm3/mol |
| Group: Trans. Met. | Discovered: 1804 |
States
| State (s, l, g): solid | |
| Melting point: 3318.2 K | Boiling point: 5298 K |
| Heat of fusion: 31.80 kJ/mol | Heat of vaporization: 746.0 kJ/mol |
Energies
| 1st ionization energy: 840 kJ/mole | |
| Electronegativity: 2.2 | 2nd ionization energy: kJ/mole |
| Electron affinity: 110 kJ/mole | 3rd ionization energy: kJ/mole |
| Specific heat: 0.13 J/gK | Heat atomization: 791 kJ/mole atoms |
Oxidation & Electrons
| Shells: 2,8,18,32,14,2 | Electron configuration: [Xe] 4f14 5d6 6s2 |
| Minimum oxidation number: -2 | Maximum oxidation number: 8 |
| Min. common oxidation no.: 0 | Max. common oxidation no.: 4 |
Appearance & Characteristics
| Structure: hcp: hexagonal close pkd | Color: bluish-white |
| Uses: hard alloys, phono needles | Toxicity: |
| Hardness: 7 mohs | Characteristics: hard, dense, inert < 100 C |
Reactions
| Reaction with air: none | |
| Reaction with 6 M HCl: none | Reaction with 6 M HCl: none |
| Reaction with 15 M HNO3: mild, => OsO4 | Reaction with 6 M NaOH: |
Other Forms
| Number of isotopes: 7 | Hydride(s): none |
| Oxide(s): OsO2 OsO4 | Chloride(s): OsCl3 OsCl4 OsCl5 |
Radius
| Ionic radius (2- ion): pm | Ionic radius (1- ion): pm |
| Atomic radius: 135 pm | Ionic radius (1+ ion): pm |
| Ionic radius (2+ ion): pm | Ionic radius (3+ ion): pm |
Conductivity
| Thermal conductivity: 87.6 J/m-sec-deg | |
| Electrical conductivity: 105.263 1/mohm-cm | Polarizability: 8.5 A^3 |
Abundance
| Source: nickel ores (sulfides) | |
| Rel. abund. solar system: -0.171 log | Abundance earth's crust: -2.8 log |
| cost, pure: 7700 $/100g | cost, bulk: $/100g |
