86Rn[222]
Radon
Noble gasesColourless gases with full outer shells, so they hardly ever react.
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
- Atomic number
- 86
- Atomic mass
- [222]
- Protons
- 86
- Neutrons
- 136
- Electrons
- 86
- Shells
- 2, 8, 18, 32, 18, 8
- State at 25 °C
- Gas
- Position
- Group 18, period 6
Proton (+)Neutron (0)Electron (−)
Discovered byFriedrich Ernst Dorn, 1900Friedrich Ernst Dorn: 1 element
Dorn found a radioactive gas given off by radium.
Did you know?
- It can build up in poorly ventilated basements, where it's a health risk.
- It is the heaviest noble gas found in nature.
Where it's found
- Seeps from rocks and soil containing uranium
What it's used for
- Earthquake and groundwater research
Try it
There's no safe home experiment for Radon. Explore it with the animated atom above instead.