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.
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.
Common misconception
All halogens are gases at room temperature because they're non-metals; all halogens form toxic compounds.
Not all halogens are gases; bromine is a liquid and iodine is a solid at room temperature. While halogens are toxic, they also form essential compounds like table salt and disinfectants.
Keywords
Halogen - Elements found in Group 7 of the periodic table.
Group - Group is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.
Halide - Refers to a compound of a halogen with another element or group.
Salt - Is a substance that forms when a metal reacts with a non-metal. These reactions typically produce solid substances that can dissolve in water, like table salt.
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
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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.