Radon

Atomic symbol: Rn
Atomic number: 86
Atomic mass: 222

Appearance: Colorless gas at 25°C

Group: 18
Period: 6
Series: Noble gases
Block: p
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶

Chemically inert, odorless and colorless.

Radioactive, highly toxic, and carcinogenic.

Fun Fact! Radon exposure is the 2nd leading cause of lung cancer after smoking. It has also been linked to other cancers like childhood leukaemia.