Atoms contain subatomic particles. State the name, relative charge, and relative mass of each of the three subatomic particles found in an atom.

Pearson Edexcel International GCSE Chemistry (4CH1) — 1.2 Atoms · State · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

Proton – +1 charge, mass 1
Neutron – 0 charge, mass 1
Electron – –1 charge, mass negligible (≈0)

Examiner tips

  • Use the exact terms ‘proton’, ‘neutron’, ‘electron’ and their charges/masses; list each particle separately to avoid missing marks.
  • Remember the electron’s mass is negligible – write ‘negligible (≈0)’ to gain the full point.”
  • common_mistakes
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Mark scheme (4 marks)

  1. Proton: relative charge +1
  2. Proton: relative mass 1; Neutron: relative mass 1
  3. Neutron: relative charge 0 (neutral / no charge)
  4. Electron: relative charge −1 AND relative mass negligible (or 0)

Key terms in this question

atom

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