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: The '''outer shell''' is the only [[Electron Orbital|electron orbital]] that is affected in [[Chemical Reaction|chemical reactions]].
: The number of [[electron]]s in the last '''Outer Shell''' determines the [[Group (Chemistry)|Group]] on the [[Periodic Table]].
: The [[Outer Shell|outer shell]] is the highest [[Energy Level|energy level]] in an [[atom]].
: [[Electron]]s in the [[Outer Shell|outer shell]] may gain enough [[energy]] from [[collision]]s or from [[Electromagnetic Radiation|electromagnetic radiation]] to leave the [[atom]] producing a free [[electron]] and turning the [[atom]] into an [[ion]].
: [[Ionising Radiation]] can cause [[electron]]s to leave the [[Outer Shell|outer shell]] leaving behind a [[Positive Ion|positively charged ion]].
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