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4.1.1.4 Relative electrical charges of subatomic particles
Paper 1 · Higher combined
Spec reference: 4.1.1.4 (under 4.1.1).
What you need to know
- from an acid react with hydroxide ions from an alkali
KO match: Ca
Support videos
- FreeScienceLessons (topic playlist): (use links below)
- FreeScienceLessons (Atomic structure playlist): https://www.youtube.com/playlist?list=PL9IouNCPbCxULWXCO9jt0PsuAbxYpw2_1
Self-assessment (checklist)
- I can state the relative electrical charge of a proton.
- I can state the relative electrical charge of a neutron.
- I can state the relative electrical charge of an electron.
- I can explain why atoms have no overall electrical
- I can describe how the number of protons in an
Key steps (method)
- Identify what the question is testing and use precise chemistry vocabulary.
- If it’s a calculation: write the equation/formula first, then substitute carefully.
Common mistakes
- Missing units/state symbols when asked.
- Giving a statement without linking cause → effect.
Exam-style questions (quick)
- Define the key term(s) for this point in the spec.
- Explain a typical property/result using particle/bonding ideas.
- Do a short calculation or interpretation step relevant to this point.
Practice questions
- PMT: Atomic structure (questions + notes): https://www.physicsandmathstutor.com/chemistry-revision/gcse-aqa/atomic-structure-and-periodic-table