Radioactive decay and decay equations: Alpha, beta negative and gamma decay: equations, metastable isotopes and penetrating power

What this note covers

1. Where decay sits in Criterion 4, and exactly how far the course goes
2. Why nuclei decay: the nuclear model, and natural versus artificial isotopes
3. Alpha decay: what is emitted, and how to balance the equation
4. Beta negative decay: a neutron becomes a proton
5. Gamma emission and metastable isotopes: the m notation
6. Penetrating power and ionising ability: the two properties, and why they run opposite
7. Background radiation, non-ionising radiation, and effects on living organisms
8. How Section A examines this — and what separates a top answer

8 sections · 12 key terms & formulas · 6 common mistakes