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Created page with "==Key Stage 3== ===Meaning=== A Group is a column on the Periodic Table with elements with the same number of electrons on the Outer Shell. ===About Group..."
==Key Stage 3==
===Meaning===
A [[Group]] is a column on the [[Periodic Table]] with [[element]]s with the same number of [[electron]]s on the [[Outer Shell]].
===About Groups===
: The [[element]]s are arranged [[group]]s of similar [[Chemical Properties]].
: [[Element]]s have similar [[Chemical Properties]] when they have the same number of [[electron]]s in the [[Outer Shell]].
{| class="wikitable"
|-
|[[File:PeriodicTableGroups.png|center|600px]]
|}
====Trends within groups====
The [[Chemical Property|chemical properties]] of [[element]]s within a [[group] are similar. However, the [[reactivity]] within a [[group]] changes as you move up or down the [[Period (Chemistry)|period]]s.
*[[Group 1]]: The [[Alkali Metal]]s all react strongly with water. The [[reactivity]] increases as you go down the [[group]].
*[[Group 2]]: The [[Alkali Earth Metal]]s all react strongly with steam and acids. The [[reactivity]] increases as you go down the [[group]].
*[[Group 7]]: The [[Halogen]]s all act as bleaching agents and kill bacteria. The reactivity decreases as you go down the [[group]].
*[[Group 0]]: The [[Noble Gases]] are all inert (unreactive).
The [[Physical Property|physical properties]] of [[element]]s within a [[group]] are similar. However, the property changes gradually as you move down the [[group]].
===Meaning===
A [[Group]] is a column on the [[Periodic Table]] with [[element]]s with the same number of [[electron]]s on the [[Outer Shell]].
===About Groups===
: The [[element]]s are arranged [[group]]s of similar [[Chemical Properties]].
: [[Element]]s have similar [[Chemical Properties]] when they have the same number of [[electron]]s in the [[Outer Shell]].
{| class="wikitable"
|-
|[[File:PeriodicTableGroups.png|center|600px]]
|}
====Trends within groups====
The [[Chemical Property|chemical properties]] of [[element]]s within a [[group] are similar. However, the [[reactivity]] within a [[group]] changes as you move up or down the [[Period (Chemistry)|period]]s.
*[[Group 1]]: The [[Alkali Metal]]s all react strongly with water. The [[reactivity]] increases as you go down the [[group]].
*[[Group 2]]: The [[Alkali Earth Metal]]s all react strongly with steam and acids. The [[reactivity]] increases as you go down the [[group]].
*[[Group 7]]: The [[Halogen]]s all act as bleaching agents and kill bacteria. The reactivity decreases as you go down the [[group]].
*[[Group 0]]: The [[Noble Gases]] are all inert (unreactive).
The [[Physical Property|physical properties]] of [[element]]s within a [[group]] are similar. However, the property changes gradually as you move down the [[group]].