Electron configuration and chemical periodicity

What this note covers

1. Write ground-state electron configurations correctly
2. Read successive ionisation energies as shell evidence
3. Explain the trend across a period
4. Explain the trend down a group
5. Handle sub-shell exceptions to the period trend
6. Justify chemical properties from valence electrons
7. How periodicity is examined and what separates a top response

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