Question
State what is meant by an isotope.
Mark scheme (2 marks):
- 1 mark: atoms of the same element / same number of protons (same atomic number).
- 1 mark: with a different number of neutrons / different mass number.
Full-mark example: "Isotopes are atoms of the same element with the same number of protons but a different number of neutrons, giving them different mass numbers (e.g. C-12 and C-14)."
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.