Osmium (Os) - Element 76 | Properties & Electron Configuration
What is Osmium?
Osmium (Os) is element 76, a transition metal in period 6, group 8. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁶ 6s².
| Atomic Number | 76 |
| Symbol | Os |
| Atomic Mass | 190.23 u |
| Category | Transition Metal |
| Period | 6 |
| Group | 8 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁶ 6s² |
| Short Config | [Xe] 4f¹⁴ 5d⁶ 6s² |
| Electronegativity | 2.2 |
| Atomic Radius | 130 pm |
| Ionization Energy | 840 kJ/mol |
| Electron Affinity | 106 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Osmium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d⁶ 6s². In noble gas shorthand, this is written as [Xe] 4f¹⁴ 5d⁶ 6s².
Osmium is a d-block element in group 8, period 6.
Periodic Trends
Electronegativity: Osmium has a Pauling electronegativity of 2.2. Within group 8, electronegativity generally decreases down the group.
Atomic Radius: 130 pm. Across period 6, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 840 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Osmium on the Interactive Periodic TableRelated Topics
Iron (Fe)
Properties of Iron - same group as Osmium
Ruthenium (Ru)
Properties of Ruthenium - same group as Osmium
Hassium (Hs)
Properties of Hassium - same group as Osmium
Cesium (Cs)
Properties of Cesium - same period as Osmium
Barium (Ba)
Properties of Barium - same period as Osmium
Lanthanum (La)
Properties of Lanthanum - same period as Osmium