Classifying matter by particles
Classifying matter by particles

Matter is made of particles such as atoms, molecules and ions. An element contains only one type of atom, while a compound contains atoms of different elements chemically bonded in a fixed ratio.
Step-by-step lessons on Edexcel IGCSE Chemistry Elements, compounds and mixtures. Each one builds up to exam-style questions. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.