This unit relates closely to unit 7G 'Particle model of solids, liquids and gases' and unit 7H 'Solutions', in which the particle model is introduced and developed. However, if teachers wish to introduce the idea of particles through elements and compounds, it could be taught before these units.
The unit provides a foundation for unit 8F 'Compounds and mixtures', unit 9E 'Reactions of metals and metal compounds' and unit 9F 'Patterns of reactivity'.
The historical impact of ideas about atoms is covered in unit 21 'Scientific discoveries' in the history scheme of work.
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