==Key Stage 3=====Meaning==='''Electron shells''' are the places around a [[nucleus]] where an [[electron]] can #REDIRECT [[orbit]] the [[nucleus]].{| class="wikitable"|-|[[File:SodiumShells.png|center|400px]]|-| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of a [[Sodium]] [[atom]] shown the '''electron shells'''.|} ===About Electron Shells===: The number of '''electron shells''' is shown by the [[period]] on the [[Periodic Table]].: The number of [[electron]]s in the [[Outer Shell|outer shell]] determines the [[Chemical Property|chemical properties]] of the [[element]].{| class="wikitable"|-|[[File:ElectronShells.png|center|600px]]|-| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of the first 20 [[element]]s in the [[Periodic TableOrbital]] showing the '''electron shells'''.|}