Osmium is a transition metal from the periodic table. It is a bluish-gray, brittle metal which is relatively rare in nature. Osmium is used in some alloys and as a catalyst in some chemical reactions. It is also used to make electrical contacts and thermocouples.
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| Atomic number | 76 |
| Group | VIIIB |
| Period | 6 |
| Mass | 190.23 |
| Latin name | Osmium |
| Electron configuration | [Xe]4f14 5d6 6s2 |
| Oxidation state | -4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8 |