Chemistry › Section F · Electronic structure and periodic properties › Topic F.5
Periodic trends
Atomic size, the energy needed to remove an electron and the energy released when one is added all change in regular ways across the periodic table. One idea, the effective nuclear charge felt by the outer electrons, explains the trends, and electron configurations explain their exceptions.
In this topic
- Effective nuclear charge
- Atomic radius
- Ionic radius
- Ionisation energy
- Two exceptions in ionisation energy
- Successive ionisation energies
- Worked example: ranking first ionisation energies
- Worked example: identifying a group
- Electron affinity
- Metallic character and electronegativity
- Common mistakes to avoid
- Key takeaways
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