Question
State the relative charges and relative masses of a proton, neutron, and electron.
[2 marks]
Mark scheme (AO1):
- Proton: charge +1, mass 1 ✓
- Neutron: charge 0, mass 1 ✓
- Electron: charge −1, mass ~0 (or 1/1836 / negligible) ✓ Award 1 mark for any one fully correct row; 2 marks for all three correct. Reject "small" without numerical value for electron mass — grade 9 candidates must quantify.
2 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.