A type of reaction in which a substance gains oxygen or loses electrons.

A chemical equation used to show the electrons lost in oxidation or the electrons gained in reduction.

A type of reaction in which a substance loses oxygen or gains electrons.

A redox reaction is one in which a substance is oxidised and another is reduced.

A chemical equation in which reacting ions are shown; unreacting ions (spectator ions) are not included.

Ionic equations: reactions of Group 1 and Group 7

Combined science

In the Chemical Analysis unit, pupils will build on their knowledge of the periodic table to explore various techniques for analysing substances and interpreting data.

In the Patterns in the Periodic Table unit, pupils learned about the arrangement of elements in the periodic table and the trends in properties of elements.

This unit explores how elements' reactions are related to electron arrangement and atomic number. It covers the properties of Groups 1, 7, and 0 and explains how these depend on outer electrons. It also predicts element reactivity and reactions based on their positions in the periodic table.

Groups of the periodic table

An atom has lost an electron from its outer shell. 

There are more electrons than protons present in the ion

There are more protons than electrons present in the ion.

What does a negative charge on an ion mean?

What type of reaction occurs when a metal atom loses an outer electron to become a positive stable ion?

Which one of the following half equations is correct?

Which half equations show a reduction reaction?

Look at this displacement reaction:
F₂ (aq) + 2 KI (aq) → I₂ (aq) + 2KF (aq).
Identify a spectator ion.

when an element replaces a less reactive element in a compound

non-metallic elements in Group 7 that react with metals to form salt

ionic compounds made of positive and negative ions

Match the keyword to the correct statement.

Each Group 2 atom transfers an outer electron to a Group 7 atom.

Each Group 2 atom transfers two outer electrons to a Group 7 atom.

Each Group 2 atom transfers two outer electrons to two separate Group 7 atoms.

Group 2 atoms form positively charged ions.

Group 2 atoms form negatively charged ions.

What happens when Group 2 elements react with a halogen?

magnesium + chlorine  →  magnesium chloride

Which is the correct symbol equation for a reaction between magnesium and chlorine?

Which is the correct formula for barium bromide?

Which of the following experiments will result in a displacement reaction?

This lesson will be removed by end of Summer Term 2025.

Ionic equations: reactions of Group 1 and Group 7

Lesson outcome

This lesson will be removed by end of Summer Term 2025.