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4.1.4 Development of the model of the atom

Paper 1 · Higher combined

What you need to know

  • Reduction is gaining of electrons.
  • Metals that are below hydrogen in the reactivity series do not react with dilute
  • acids.

KO match:  H₂

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Self-assessment (checklist)

  • I can describe how the results from the alpha particle

Key steps (method)

  • Identify what the question is testing (definition / calculation / explanation).
  • Use the correct chemistry vocabulary and link cause → effect.
  • If it’s a calculation: write the equation/formula first, then substitute carefully.

Common mistakes

  • Giving a fact without linking it to the question.
  • Missing units / state symbols when asked.
  • Not showing enough working to score method marks.

Exam-style questions (quick)

  1. Define the key term(s) for this mini-topic.
  2. Explain a typical property/result using particle/bonding ideas.
  3. Do a short calculation or interpretation step relevant to this mini-topic.