76Os190.23
Osmium
Transition metalsHard, shiny metals that conduct heat and electricity well and often form coloured compounds.
[Xe] 4f¹⁴ 5d⁶ 6s²
- Atomic number
- 76
- Atomic mass
- 190.23
- Protons
- 76
- Neutrons
- 114 (most common)
- Electrons
- 76
- Shells
- 2, 8, 18, 32, 14, 2
- State at 25 °C
- Solid
- Position
- Group 8, period 6
Proton (+)Neutron (0)Electron (−)
Discovered bySmithson Tennant, 1803Smithson Tennant: 2 elements
Named from the Greek osme, smell, because its oxide has a sharp smell.
Did you know?
- It is the densest natural element: a litre would weigh over 22 kg.
- Its oxide is very toxic.
Where it's found
- Platinum ores
What it's used for
- Tips of fountain-pen nibs
- Very hard alloys
Try it
There's no safe home experiment for Osmium. Explore it with the animated atom above instead.