◄ At   Xe ▲   ▼ Rn   Fr ►

Radon ∙ radon ∙ radon ∙ radón
group ‘n+n’ / noble gases and (rather) noble metals: R, RO₄

• melting point: -71°C
• boiling point: -61.8°C
• density: 9.23 g/l

☢ radioisotopes: Rn-222 (T1/2=3.82 d) NORM