Radon is a radioactive noble gas produced naturally by decay in rocks and soils and is an important indoor-air hazard.
Atomic number
86
Category
Noble gas
Period
6
Group
18
State
Gas
Fun facts about Radon
It can accumulate in poorly ventilated buildings.
Long-term exposure to elevated radon increases lung-cancer risk.
Testing is the only reliable way to determine indoor concentrations.
Common uses of Radon
Geological tracing
Limited scientific research
Where Radon sits in the periodic table
Radon is classified as a noble gas in period 6 and group 18 of the periodic table. Under the conditions represented in this reference, its state is gas.
Quick chemistry revision
For quick revision, pair the symbol Rn with atomic number 86 and the listed atomic mass [222]. The summary, facts, and uses above keep those element properties together in one reference.