Difference between revisions of "Periodic Table"
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===Periods=== | ===Periods=== | ||
| − | : The [[period]]s are arranged by the number of [[Electron Shell]]s. | + | : The [[Period (Chemistry)|period]]s are arranged by the number of [[Electron Shell]]s. |
{| class="wikitable" | {| class="wikitable" | ||
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====Trends within Periods==== | ====Trends within Periods==== | ||
| − | : The [[Chemical Property|chemical]] and [[Physical Property|physical properties]] of [[element]]s change as you move along a [[period]]. | + | : The [[Chemical Property|chemical]] and [[Physical Property|physical properties]] of [[element]]s change as you move along a [[Period (Chemistry)|period]]. |
{| class="wikitable" | {| class="wikitable" | ||
| style="height:20px; width:300px; text-align:center;" |'''Period 2 Melting Points''' | | style="height:20px; width:300px; text-align:center;" |'''Period 2 Melting Points''' | ||
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|[[File:Period3MeltingPoints.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;" |There is a trend in the [[Melting Point]]s as you move along the [[Period (Chemistry)|period]]. |
| − | | style="height:20px; width:300px; text-align:center;" |A similar trend can be seen in the next [[period]]. | + | | style="height:20px; width:300px; text-align:center;" |A similar trend can be seen in the next [[Period (Chemistry)|period]]. |
|} | |} | ||
Revision as of 09:15, 1 October 2018
Contents
Key Stage 3
Meaning
The Periodic Table is a chart listing all the known elements arranged in order of Atomic Number and in columns of elements with similar properties.
About The Periodic Table
- The modern Periodic Table was arranged by a scientist called Mendeleev. Others had tried to arrange all the elements before, but Mendeleev was the first to arrange by both Atomic Number and chemical properties.
- The columns of the Periodic Table are called Groups.
- The rows of the Periodic Table are called Periods.
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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.
Periods
- The periods are arranged by the number of Electron Shells.
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Trends within Periods
- The chemical and physical properties of elements change as you move along a period.
| Period 2 Melting Points | Period 3 Melting Points |
 |
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| There is a trend in the Melting Points as you move along the period. | A similar trend can be seen in the next period. |