Ions, formulae and naming: Common cations and anions, naming ionic and covalent molecular compounds, and electron dot diagrams

What this note covers

1. What an ion is and why ions form
2. Predicting ionic charge from the periodic table
3. Polyatomic ions and the Information Sheet tables
4. Building ionic formulae by charge balance
5. Naming covalent molecular compounds
6. Valency and how many bonds an atom forms
7. Electron dot diagrams for molecules
8. How this topic is examined in Section D

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