Year 9

Atoms, models and radioactivity

Build the particle-level foundation needed for equations, electricity and later periodic trends.

Subtopics

How atomic models changed

Connect electron, proton and neutron discoveries with revisions to the atomic model.

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Protons, electrons and isotopes

Use atomic and mass numbers to determine particle counts and distinguish isotopes from ions.

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Radioactive decay and half-life

Describe nuclear instability, radiation and the statistical pattern of half-life.

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Worked examples Practice