Group 7 (halogens)
I can describe the pattern in reactivity of Group 7 non-metals and name the products of reactions between metals and halogens.
Group 7 (halogens)
I can describe the pattern in reactivity of Group 7 non-metals and name the products of reactions between metals and halogens.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The elements in Group 7 are all non-metals that have coloured vapours, most of which are toxic.
- The state of the elements at room temperature changes from gas to solid, down Group 7.
- Reactivity decreases down Group 7.
- Halogens react with Group 1 and 2 metals to form metal halides.
- Metal halides are soluble in water.
Keywords
Halogen - A halogen is an element found in Group 7 of the periodic table.
Group - A group is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.
Halide - A halide is the name of a salt formed from a halogen and another element, e.g., sodium chloride (NaCl).
Salt - A salt is a substance formed when a metal reacts with a non-metal. These reactions typically produce solid substances that can dissolve in water, such as table salt.
Common misconception
All halogens are gases at room temperature because they're non-metals; all halogens form toxic compounds.
Not all halogens are gases at room temperature; bromine is a liquid and iodine is a solid. Halogens can be toxic in their elemental form or in high concentrations, but they also form essential compounds, like table salt and disinfectants.
To help you plan your year 9 science lesson on: Group 7 (halogens), download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 science lesson on: Group 7 (halogens), download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Patterns in the periodic table unit, dive into the full secondary science curriculum, or learn more about lesson planning.
Equipment
Spotting tiles, aqueous samples of each halogen, sodium halide salts, dropping pipettes or bottles.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
A pale yellow gas at room temperature.
A pale green gas at room temperature.
A reddish–brown liquid at room temperature.
A purple–black solid at room temperature.