
A complete, ready-to-teach lesson for Unit 1 (Principles and Applications of Science I), chemistry section: electron affinity, atomic radius and ionic radius across periods and groups.
Learning objectives:
- Define first and second electron affinity and write equations for them.
- Explain why first electron affinities are exothermic and second electron affinities are endothermic.
- Explain the trends in atomic radius across a period and down a group.
- Compare the radii of atoms and their ions across period 3.
What’s included:
- Student worksheet (PDF and editable Word)
- Teacher version with model answers and mark schemes (PDF and editable Word)
- Teacher notes: lesson flow, common misconceptions and practical/safety notes
- Retrieval starter (5 marks)
- Structured tasks with key-idea boxes and clear diagrams
- Check for Understanding quiz (10 marks) with a confidence self-assessment
- Exam-style practice (15 marks), ending with a levels-marked 6-mark question with indicative content
Specification coverage:
- A1 · Periodicity: electron affinity and its trends.
- A1 · Periodicity: atomic radius and ionic radius trends.
About 60 minutes of teaching; the exam-style section works in class or as homework. All questions are original.
Written for the Pearson BTEC Level 3 Nationals in Applied Science. Not endorsed by Pearson. Single-school licence.
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