86 · Rn
Radon
Thorium emanation observed by Rutherford in 1899. Radium emanation identified by Dorn in 1900.
Identity
- Atomic number
- 86
- Symbol
- Rn
- Canonical name
- Radon
- Category
- noble gas
- Group
- 18
- Period
- 6
- Block
- p
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- [222] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.
- Electron configuration
- [Xe] 4f14 5d10 6s2 6p6
- Electrons per shell
- 2, 8, 18, 32, 18, 8
- Standard state
- gas
- Density
- 9.73 g/L
- Melting point
- 202 K
- Boiling point
- 211.5 K
- Electronegativity
- 2.2 Pauling
- First ionization energy
- 1,037 kJ/mol
- Electron affinity
- -68 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
Conventional mass number: 222
History
Thorium emanation
Observation · confirmed · 1899
Rutherford observes a radioactive emanation from thorium. This is not yet the identification of radium emanation as an element.
Radium emanation
Identification · confirmed · 1900
Dorn identifies radium emanation, which would be named radon.
Etymology
- Theme
- property
- Language
- latin
- Root
- radium
- Meaning
- radium emanation
Scientists
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements