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: An [[atom]] of [[Radon]] has a full [[Outer Shell|outer shell]] so it is [[inert]].
==Key Stage 4==
[[File:RnKS4.PNG|right|200px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Radon]].]]
===Meaning===
[[Radon]] is a [[radioactive]] [[Group 0]] [[element]], on the [[Periodic Table]], with 86 [[proton]]s in the [[Atomic Nucleus|nucleus]].