86 Rn 222
Radon
noble gas
Properties
- Atomic number
- 86
- Atomic mass
- 222 u
- Category
- noble gas
- Group
- 18
- Period
- 6
- Block
- p-block
- State (room temp)
- Gas
- Outer-shell electrons
- 8
- Electronegativity
- 2.2 (Pauling)
- Density
- —
- Melting point
- -71.15 °C
- Boiling point
- -61.65 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶
Noble-gas shorthand: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
Electrons per shell: 2, 8, 18, 32, 18, 8 — that's 8 in the outermost shell.
About Radon
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
- Discovered by Friedrich Ernst Dorn
- Appearance: colorless gas, occasionally glows green or red in discharge tubes
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.