A halogen is an element found in Group 7 of the periodic table.

A group is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.

A halide is the name of a salt formed from a halogen and another element, e.g., sodium chloride (NaCl).

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.

Group 7 (halogens)

Science

In the Atomic structure and the periodic table unit, pupils will build on this knowledge to learn about how the structure of atoms in each element determine its position on the periodic table and affects its chemical and physical properties.

In the Atoms, elements and compounds unit, pupils learnt about atoms, the differences between elements and compounds and how particles reorganise in a chemical reaction

This unit explores the periodic table, including the principles behind Mendeleev's design, the arrangement of elements into periods and groups, and the classification of metals and non-metals. It examines how the physical and chemical properties of elements predict reaction patterns.

Patterns in the periodic table

Physical activity and equipment requiring safe use

Which of the following elements is a halogen?

What happens to the reactivity of the halogens as you go down Group 7?

The state of iodine at room temperature is ...

A reddish–brown liquid at room temperature.

A purple–black solid at room temperature.

Match the following halogens to their correct description.

Which of the following are products of the reaction between a Group 1 metal and a halogen?

Name the product of the reaction between potassium and bromine.

Starting with the first step, sort the following steps into the correct order for conducting a chemical experiment. 

Which element is in Group 7 and Period 3 of the periodic table?

A substance that turns blue litmus paper red.

A substance that forms when a metal reacts with a non–metal.

A substance that does not dissolve in water.

Which of the following statements correctly describes a salt?

A substance with a pH of 12 is considered to be ...

Which of the following describes a physical change?

The process of a substance in the solid state changing directly into the gas state is called ...

Content guidance

Risk assessment required - equipment

Adult supervision required

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Content guidance

Supervision

Worksheet