Elements, compounds and mixtures

Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.

Atoms and molecules

Atoms are the building blocks of everything. Atoms can form strong bonds with each other, making molecules.

Symbols and formulae

Letters from the alphabet are used to represent chemical elements. An element’s chemical symbol is a single capital letter or a capital letter followed by a lower case letter.

What is carbon?

Find out about the structure and properties of the element carbon.

What are elements?

A visual explanation of chemical elements.

What is oxygen?

A visual explanation of oxygen.

What is nitrogen?

A visual explanation of nitrogen.

What is hydrogen?

A visual explanation of hydrogen.

23 Classroom videos

We have a selection of great videos for use in the classroom