Difference between revisions of "Periodic Table"
(→About The Periodic Table) |
|||
| Line 21: | Line 21: | ||
|[[File:PeriodicTableGroups.png|center|600px]] | |[[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]]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=== | ===Periods=== | ||
| Line 28: | Line 36: | ||
|- | |- | ||
|[[File:PeriodicTablePeriods.png|center|600px]] | |[[File:PeriodicTablePeriods.png|center|600px]] | ||
| + | |} | ||
| + | |||
| + | ====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]]. | ||
|} | |} | ||
Revision as of 19:14, 30 September 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.
 |
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.
 |
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.
 |
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 |
 |
 |
| There is a trend in the Melting Points as you move along the period. | A similar trend can be seen in the next period. |