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==Key Stage 3==
===Meaning===
'''Electron shells''' are the places around a [[nucleus]] where an [[electron]] can [[orbit]] the [[nucleus]].
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|[[File:SodiumShells.png|center|400px]]
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| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of a [[Sodium]] [[atom]] shown the '''electron shells'''.
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===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"
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|[[File:ElectronShells.png|center|800px]]
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| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of the first 20 [[element]]s in the [[Periodic Table]] showing the '''electron shells'''.
|}
==Key Stage 4==
===Meaning===