Radon (Rn) has atomic number 86 and is classified as a noble gas. It sits in Group 18, period 6 of the periodic table. Its practical relevance includes research only; it is primarily important as a naturally occurring radioactive health hazard.
ELEMENT DATA
Quick facts
#Atomic number86
AaSymbolRn Relative
◉Atomic mass[222] State at room temperature Gas
⌘Group18
Position in the periodic table
Noble gases have filled valence shells and are relatively unreactive under ordinary conditions. Their inertness is valuable in lighting, welding, semiconductor processing, cryogenics and scientific instrumentation.
Radon belongs to period 6. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Radon matters
In engineering and technology, radon is associated with research only; it is primarily important as a naturally occurring radioactive health hazard. The importance of the element may come from the pure element itself, from compounds containing it, or from its role as an alloying, electronic, catalytic or nuclear material.
Engineering and scientific context
Material behavior should never be inferred from the element name alone. Purity, isotope composition, crystal structure, processing history, temperature and the surrounding chemical environment can all change performance. In alloys and compounds, the contribution of radon depends on concentration and interaction with the other constituents.
Safety and handling
Radon is radioactive, so any practical work involving it requires specialist radiological controls, approved facilities and isotope-specific procedures.
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