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|[[File:PeriodicTableGroups.png|center|600px]]
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====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]]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]].
===Periods===
|-
|[[File:PeriodicTablePeriods.png|center|600px]]
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====Trends within Periods====
: The chemical and physical properties of elements change as you move along a [[period]].
{| class="wikitable"
| style="height:20px; width:300px; text-align:center;" |'''Period 2 Melting Points'''
| style="height:20px; width:300px; text-align:center;" |'''Period 3 Melting Points'''
|-
|[[File:Period2MeltingPoints.png|center|300px]]
|[[File:Period3MeltingPoints.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:center;" |There is a trend in the [[Melting Point]]s as you move along the [[period]].
| style="height:20px; width:300px; text-align:center;" |A similar trend can be seen in the next [[period]].
|}