Os
Osmium
Osmium is a chemical element with the symbol Os and atomic number 76. It has a standard atomic weight of 190.23, sits in period 6 and group 8, and is classified as a transition metal.
Properties
| Symbol | Os |
|---|---|
| Atomic number | 76 |
| Standard atomic weight | 190.23 |
| Category | Transition metal |
| Group | 8 |
| Period | 6 |
| Electron configuration | [Xe] 4f14 5d6 6s2 |
| Outer-shell electrons | 2 |
The figure of 190.23 is a standard atomic weight.
Calculate with osmium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 8
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.