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|[[File:ElectronConfigurationElectronicConfiguration.png|center|800px]]
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| style="height:20px; width:200px; text-align:center;" |A [[diagram]] showing the '''electron shells''' and '''electrons''' in the first 20 [[element]]s on the [[Periodic Table]].
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: [[Atom]]s in the same [[Group (Chemistry)|group]] have similar [[Chemical Property|chemical properties]] because they all have the same number of [[electron]]s in their [[Outer Shell]].