O-LevelPhysicsNuclear Physics5054/11 · May/June 2011 · Q401 Mark

Chlorine exists as two isotopes. One has a nucleon number (mass number) of 35 and the other has a nucleon number (mass number) of 37. Which table shows the correct numbers of protons and neutrons in the isotopes?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Aisotope 1: protons 17, neutrons 18; isotope 2: protons 17, neutrons 20

Bisotope 1: protons 18, neutrons 17; isotope 2: protons 20, neutrons 17

Cisotope 1: protons 35, neutrons 17; isotope 2: protons 37, neutrons 17

Disotope 1: protons 17, neutrons 35; isotope 2: protons 17, neutrons 37

✓ Correct answer

A: isotope 1: protons 17, neutrons 18; isotope 2: protons 17, neutrons 20

Oracle Prep sorts past-paper questions by topic, so you can drill Nuclear Physics and see which topics are most likely to come up next.

Topic: Nuclear Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2011 Paper 1 Variant 1, question 40.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content