Difference between revisions of "Group 1"
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: '''Alkali Metals''' all [[Chemical Reaction|react]] strongly with [[water]] to produce [[Metal Hydroxide|metal hydroxides]] and [[Hydrogen]] [[gas]]. | : '''Alkali Metals''' all [[Chemical Reaction|react]] strongly with [[water]] to produce [[Metal Hydroxide|metal hydroxides]] and [[Hydrogen]] [[gas]]. | ||
: '''Alkali Metals''' all produce strong [[alkali]]s. | : '''Alkali Metals''' all produce strong [[alkali]]s. | ||
+ | {| class="wikitable" | ||
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+ | |[[File:Group1ElectronShells.png|center|200px]] | ||
+ | | style="height:20px; width:600px; text-align:center;" |The [[reactivity]] increases as you go down the group because: | ||
+ | * | ||
+ | |} | ||
===Physical Properties=== | ===Physical Properties=== |
Revision as of 17:09, 26 November 2018
Contents
Key Stage 4
Meaning
Group 1 elements, also known as Alkali Metals on the Periodic Table are the elements which have only one electron in their outer shell.
Group 1 elements are shown in light purple at the far left of the Periodic Table. NB: Hydrogen is often shown in Group 1 due to having a single electron in the outer shell however it is not considered an Alkali Metal because it has very few properties in common with Alkali Metals. |
About the Alkali Metals
- The Alkali Metals have similar chemical properties because they all have one electron on their outer shell.
- Alkali Metals all produce ions with a +1 relative charge because they lose an electron in chemical reactions.
The Alkali Metals in order from least reactive to most reactive are:
Chemical Properties
- Alkali Metals are all highly reactive and will oxidise quickly in the presence of Oxygen.
- Alkali Metals all react strongly with water to produce metal hydroxides and Hydrogen gas.
- Alkali Metals all produce strong alkalis.
The reactivity increases as you go down the group because:
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Physical Properties
- Alkali Metals have a low density compared to other metals.
- Alkali Metals are all solid at room temperature but have a low melting point compared to other metals.
- Alkali Metals are soft and can be easily cut.
- Alkali Metals all appear shiny (before they oxidise).