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==Key Stage 3==
===Meaning===
[[File:SodiumShells.png|right|300px|thumb|A [[diagram]] showing the three '''[[Electron Orbital|electron shells''' ]] of a [[Sodium]] [[atom]]. The '''outer shell''' is the [[Electron Orbital|electron orbital]] furthest from the [[Atomic Nucleus|nucleus]].]]
The [[Outer Shell|outer shell]] is the [[Electron Orbital|electron orbital]] furthest from the [[Atomic Nucleus|nucleus]] of an [[atom]].