Radon: Properties, uses, and history

Radon is a chemical element belonging to the 18th group of noble gases. In its gaseous form, it is colourless, odourless and tasteless, and in solid form, it is reddish in colour. In the periodic table, it has the number 86 and the symbol Rn. Its average mass is 222, which means that on average it has 222-86 = 136 neutrons.

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