Predicting reactivity using the periodic table
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Explainer Video
Summary
Predicting reactivity using the periodic table
In a nutshell
During a chemical reaction, elements are keen on combining with another element to form a new molecule. To what extent an element is keen on reacting depends on its reactivity. You can predict the reactivity of elements once you know the trend.
Group 0
Group elements are located in the last column of the periodic table. They are known as the noble gases and are all inert.
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Group 1
Group metals are located in the first column of the periodic table and are known as alkali metals.
Group metals become more reactive going down the group. They react with water to form an alkaline solution.
Example
Lithium fizzes when it reacts with water. However, rubidium explodes when in contact with water.
Group 7
Group elements are located in the second to last column of the periodic table. They are known as the halogens.
The reactivity of the halogens down the group is opposite to that of the alkali metals. Group elements become less reactive going down the group.
Example
Chlorine reacts vigorously with metals whereas iodine reacts very slowly with metals.
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FAQs - Frequently Asked Questions
What is the reactivity trend for Group 7?
Group 7 elements become less reactive going down the group. For example, chlorine reacts vigorously with metals whereas iodine reacts very slowly with metals.
What are Group 0 elements known as?
Group 0 elements are also known as the noble gases.
What is the reactivity trend for Group 1 metals?
Group 1 metals become more reactive going down the group. For example, lithium fizzes when it reacts with water. However, rubidium explodes when in contact with water.