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|[[File:Group7ElectronShells.png|center|100px]]
|[[File:Group7ElectronShielding.png|center|100px]]| style="height:20px; width:500px400px; text-align:left;" |In a [[Chemical Reaction|chemical reaction]] an extra [[electron]] is added to the [[Outer Shell|outer shell]].
The [[reactivity]] decreases as you go down the group because:
*Even though the [[charge]] of the [[Atomic Nucleus|nucleus]] increases the outer [[electron]]s are shielded from most of the [[Positive Charge|positive charge]] of the [[Atomic Nucleus|nucleus]] by [[electron]]s in the [[Inner Shell|inner shells]].
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===Physical Properties===
The [[Physical Property|physical properties]] of '''Halogens''' changes significantly as you go down the [[Periodic Table]]: