Radon

Atomic number

86

Atomic mass (u)

222.01758

Category

Noble gas

Standard state

Gas

Melting point

-71.15 °C (202 K)

Boiling point

-61.7 °C (211.45 K)

Density (g/cm³)

0.00973

Electronegativity (Pauling)

Not reported in this source

Electron configuration

[Xe]6s2 4f14 5d10 6p6

Oxidation states

0

Atomic radius (pm)

220

First ionization energy (eV)

10.745

Discovery & recognition

Discovery year / period (PubChem)

1900

Discovery credited to (RSC)

Friedrich Ernst Dorn

Date or period recorded by RSC

1900

Discovery place

Not supplied in the structured record; see the RSC history source.

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Radon is produced naturally from the decay of the isotope radium-226, which is found in rocks.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.