Matter 2 – Quick Revision

Atom – the smallest building block of matter.

Element – a pure substance made of only one kind of atom (oxygen, iron, gold, carbon).

Compound – two or more different elements joined together (water = hydrogen + oxygen).

Molecule – a group of atoms joined together.

• Oxygen → element
• Water → compound
• Iron → element
• Salt → compound

Atoms are extremely small – we cannot see a single atom.