More Lessons for IGCSE Chemistry
A series of free IGCSE Chemistry Activities and Experiments (Cambridge IGCSE Chemistry).
Group 0 and 7 - Noble Gases and Halogens
In this lesson, we will look at the
Group 0 - Noble gases
The following diagram shows the Noble Gases (Group 0 Elements) and their properties. Scroll down the page for more examples and explanations.
The elements in group 0 are called the noble gases or inert gases. They are found at the right-hand column of the periodic table. They consists of helium, neon, argon, krypton, xenon and radon.
The noble gases have the following common properties:
Their boiling point and density increases as you go down the group.
Uses of noble gases
Argon provides the inert atmosphere in filament lamps because it is non-flammable. Helium can be used in airships because it has a low density.
The following diagram shows the Halogens (Group 7 Elements) and their properties. Scroll down the page for more examples and explanations.
Compare the properties of the halogens
Flourine - colourless gas, most reactive
Chlorine - Pale green gas, toxic
Bromine - Orange liquid, toxic, volatile
Iodine - Dark grey solid, cystaline, sublimes forming purple vapours
Describe the Halide Reactions
Explain the order of reactivity and apply to displacement reactions
As you go down the group the order of reactivity decreases.
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