86Rn222.000
Noble Gasp-blockRadioactive
Radon
Element 86 on the periodic table, symbol Rn, group 18, period 6.
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.
Appearance: colorless gas, occasionally glows green or red in discharge tubes
Properties
- Atomic Number
- 86
- Atomic Mass
- 222.0000 u
- Group
- 18
- Period
- 6
- Block
- p-block
- Category
- Noble Gas
- State at 25 °C
- Gas
- Melting Point
- 202 K · -71.1 °C
- Boiling Point
- 211.5 K · -61.6 °C
- Density
- 9.73 g/L
- Atomic Radius
- 120 pm
- Electronegativity
- 2.2
- Oxidation States
- 0, +2
- Abundance in Crust
- 4.00e-13 mg/kg
- Discovered
- 1900
- Discovered By
- Friedrich Ernst Dorn
Electron Configuration
[Xe] 4f14 5d10 6s2 6p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6
Ionisation Energies (kJ/mol)
- 1. 1,037
Elements near Radon
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.