Isotopes: past paper questions

Where the questions come from

• Question 3May/June 2026, paper 11Multiple choice1 markHas a diagram

  The difference between the nucleon number and the proton number indicates the number of ......1...... in the atom. Atoms that have different nucleon numbers but the same proton number are called ......2......

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• Question 2Oct/Nov 2025, paper 21Structured4 marks

  A sample of sulfur found on the planet Mars contains four isotopes. Table 2.1 shows the percentage abundances of these four isotopes.

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• Question 5Oct/Nov 2024, paper 11Multiple choice1 mark

  The formulae for two ions are given. $${}_{34}^{72}{\text{X}}^{2-}{}_{34}^{74}{\text{X}}^{2-}$$ Which statement is correct?

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• Question 4Oct/Nov 2023, paper 11Multiple choice1 mark

  The letters X, Y and Z represent different atoms. $${}_{19}^{40}\mathrm{X}{}_{19}^{39}\mathrm{Y}{}_{20}^{40}\mathrm{Z}$$ Which statement is correct?

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• Question 3May/June 2026, paper 12Multiple choice1 mark

  Which number is different for two isotopes of the same element?

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• Question 2Oct/Nov 2025, paper 22Structured4 marks

  A sample of titanium found on an asteroid contains four isotopes. Table 2.1 shows the percentage abundances of these four isotopes.

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• Question 8Oct/Nov 2024, paper 11Multiple choice1 mark

  The table gives some information about barium and chlorine. | | relative atomic mass | group in Periodic Table | | :--- | :---: | :---: | | barium | 137 | II | | chlorine | 35.5 | VII | Using this information only, a student makes three statements.

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• Question 4Oct/Nov 2023, paper 12Multiple choice1 mark

  Which statement about the isotopes of bromine is correct?

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• Question 4May/June 2025, paper 11Multiple choice1 mark

  Which definition of isotopes is correct?

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• Question 3May/June 2023, paper 11Multiple choice1 mark

  The numbers of electrons, protons and neutrons in four different particles are shown.

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• Question 1Oct/Nov 2024, paper 21Structured7 marksHas a diagram

  Fig. 1.1 shows the electronic configurations of five atoms, D, E, F, G and H. Answer the questions about these electronic configurations. Each electronic configuration may be used once, more than once or not at all.

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• Question 3May/June 2023, paper 12Multiple choice1 mark

  Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative atomic masses 79 and 81. What can be deduced about naturally occurring bromine from this information only?

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• Question 6May/June 2025, paper 12Multiple choice1 markHas a diagram

  The table shows data about the two isotopes in a sample of the element europium.

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• Question 1Oct/Nov 2024, paper 22Structured7 marksHas a diagram

  Fig. 1.1 shows the electronic configurations of five atoms, A, B, C, D and E. Answer the questions about these electronic configurations. Each electronic configuration may be used once, more than once or not at all.

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• Question 3May/June 2024, paper 11Multiple choice1 markHas a diagram

  A chlorine atom, Z, has a nucleon number of 37. Which row is correct?

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• Question 4May/June 2024, paper 11Multiple choice1 markHas a diagram

  Which particles are isotopes of the same element?

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• Question 4May/June 2024, paper 12Multiple choice1 markHas a diagram

  An element has two isotopes of relative isotopic masses $x$ and $x+2$. The diagram shows the composition of atoms in a sample of the element. What is the relative atomic mass of the sample of the element?

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• Question 8May/June 2024, paper 12Multiple choice1 mark

  Which statement is correct?

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