Difference between revisions of "Group (Chemistry)"
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==Key Stage 3== | ==Key Stage 3== | ||
===Meaning=== | ===Meaning=== | ||
| − | A | + | 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=== | ===About Groups=== | ||
| − | : The [[element]]s are arranged | + | : The [[element]]s are arranged '''groups''' of similar [[Chemical Property|chemical properties]]. |
: [[Element]]s have similar [[Chemical Property|chemical properties]] when they have the same number of [[electron]]s in the [[Outer Shell]]. | : [[Element]]s have similar [[Chemical Property|chemical properties]] when they have the same number of [[electron]]s in the [[Outer Shell]]. | ||
| Line 12: | Line 12: | ||
|} | |} | ||
====Trends within groups==== | ====Trends within groups==== | ||
| − | The [[Chemical Property|chemical properties]] of [[element]]s within a | + | 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 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 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 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). | *[[Group 0]]: The [[Noble Gases]] are all inert (unreactive). | ||
| − | The [[Physical Property|physical properties]] of [[element]]s within a | + | The [[Physical Property|physical properties]] of [[element]]s within a '''group''' are similar. However, the property changes gradually as you move down the '''group'''. |
Revision as of 09:25, 1 October 2018
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 Groups
- The elements are arranged groups of similar chemical properties.
- Elements have similar chemical properties when they have the same number of electrons in the Outer Shell.
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Trends within groups
The chemical properties of elements within a group are similar. However, the reactivity within a group changes as you move up or down the periods.
- Group 1: The Alkali Metals all react strongly with water. The reactivity increases as you go down the group.
- Group 2: The Alkali Earth Metals all react strongly with steam and acids. The reactivity increases as you go down the group.
- Group 7: The Halogens 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 properties of elements within a group are similar. However, the property changes gradually as you move down the group.