AQA GCSE Chemistry

Revision Notes

1.1.7 The Structure of the Atom

Relative Charges of the Proton, Electron & Neutron

  • Protons, neutrons and electrons are the subatomic particles that make up atoms
  • Each of the subatomic particles has a different electric charge, which is summarised in the following table

Sub-Atomic Particle Comparison (Charge) Table

Sub-atomic Particle comparison table-charge, downloadable IGCSE & GCSE Chemistry revision notes

  • Atoms are neutral overall
    • Even though they contain charged subatomic particles, the charges cancel each other out in an atom
  • Since the charge on a proton is +1 and on an electron is -1, then the number of protons must be the same as the number of electrons for the charges to cancel each other out and produce a neutral atom

Exam Tip

Protons are Positive sub-atomic particles while Neutrons are Neutral. That leaves the electrons which must therefore be negative.

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Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.

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