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Created page with "==Key Stage 3== ===Meaning=== right|300px|thumb|A [[diagram showing the three '''electron shells''' of a Sodium atom. The '''outer shell''' i..."
==Key Stage 3==
===Meaning===
[[File:SodiumShells.png|right|300px|thumb|A [[diagram]] showing the three '''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]].
===About the Outer Shell===
: 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 '''orbital''' ([[Outer Shell]]) determines the [[Group (Chemistry)|Group]] on the [[Periodic Table]].
{| class="wikitable"
|-
|[[File:ElectronicConfiguration.png|center|800px]]
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| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows that the number of [[electron]]s in the '''outer shell''' determines which [[group]] the [[element]]s have been placed into in the [[Periodic Table]]. NB [[Group 0]] used to be called [[Group 8]] but this caused confusion because most [[element]]s in [[Group 8]] have 8 [[electron]]s in their [[Outer Shell]] but [[Helium]] only has 2, so it was renamed [[Group 0]].
|}
===Meaning===
[[File:SodiumShells.png|right|300px|thumb|A [[diagram]] showing the three '''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]].
===About the Outer Shell===
: 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 '''orbital''' ([[Outer Shell]]) determines the [[Group (Chemistry)|Group]] on the [[Periodic Table]].
{| class="wikitable"
|-
|[[File:ElectronicConfiguration.png|center|800px]]
|-
| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows that the number of [[electron]]s in the '''outer shell''' determines which [[group]] the [[element]]s have been placed into in the [[Periodic Table]]. NB [[Group 0]] used to be called [[Group 8]] but this caused confusion because most [[element]]s in [[Group 8]] have 8 [[electron]]s in their [[Outer Shell]] but [[Helium]] only has 2, so it was renamed [[Group 0]].
|}