#76
Osmium
transition metal· Solid·190.233 u
Osmium (from Greek osme (ὀσμή) meaning "smell") is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3.
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Identity
- Symbol
- Os
- Atomic Number
- 76
- Atomic Mass
- 190.233 u
- Category
- transition metal
- Block
- d-block
- Period
- 6
- Group
- 8
- Appearance
- silvery, blue cast
- Year Discovered
- 1803 CE
- Discovered By
- Smithson Tennant
- Named By
- odor
Electrons
- Configuration
- [Xe] 4f14 5d6 6s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d6
- Shells
- 2, 8, 18, 32, 14, 2
- Electronegativity
- 2.2
- Electron Affinity
- 103.99
- Oxidation States
- +4, +3
- Ionization Energies
- 840, 1600
Physical Properties
- State at
- Solid
- Melting Point
- 3306
- Boiling Point
- 5285
- Density
- 22.59
- Molar Heat
- 24.7 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 144 pm
- Van der Waals
- 216 pm
- Metallic Radius
- 135 pm
- Mohs Hardness
- 7
- Brinell Hardness
- 3920 MPa MPa
- Vickers Hardness
- 3000 MPa MPa
- Bulk Modulus
- 462 GPa GPa
- Shear Modulus
- 222 GPa GPa
- Young's Modulus
- 559 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 87.6 W/(m K) W/(m·K)
- Electrical Conductivity
- 12.3 MS/m S/m
- Specific Heat
- 130 J/(kg K) J/(g·K)
- Heat of Vaporization
- 628 kJ/mol kJ/mol
- Heat of Fusion
- 57.9 kJ/mol kJ/mol
Abundance
- Universe
- 3.00 ppb
- Sun
- 2.00 ppb
- Meteorite
- 490 ppb
- Earth's Crust
- 2.00 ppb
- Ocean
- 2e-9 ppm
- Human Body
- 0