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.
- Year 9
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.
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.
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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Prior knowledge starter quiz
6 Questions
Q1.Starting with the first step, sort the following steps into the correct order for conducting a chemical experiment.
Q2.Which element is in Group 7 and Period 3 of the periodic table?
Q3.Which of the following statements correctly describes a salt?
Q4.A substance with a pH of 12 is considered to be ...
Q5.Which of the following describes a physical change?
Q6.The process of a substance in the solid state changing directly into the gas state is called ...
Assessment exit quiz
6 Questions
Q1.Which of the following elements is a halogen?
Q2.What happens to the reactivity of the halogens as you go down Group 7?
Q3.The state of iodine at room temperature is ...
Q4.Match the following halogens to their correct description.
