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==Key Stage 3==
===Meaning===
[[File:RadonSymbolRadonSymbol1.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Radon]].]]
[[Radon]] is a [[radioactive]] [[Group 0]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 86.
===About Radon===