First Ionisation Energies and Electron Affinity

Originally made for the BTEC National Applied Science Level 3 course, this is the second lesson of Unit 1 Learning Aim A2.

The lesson introduces the concept of first ionisation energies and electron affinity trends across period and down groups. Students will define each and apply knowledge to problems and tasks throughout the lesson.

Anomalies in period 2 & 3 are explained simply using knowledge gained about how the sub-shells are filled.

Finally trends in electron affinity are explained and also explains why the second electron affinity of oxygen is higher than the first.

Final plenary are some past exam questions from A-level Chemistry chosen to closely match the content.