Physics (AS & A Level) · Oct / Nov 2023 · Paper 13 · Question 38

The table shows the number of nucleons and the total number of particles (protons, neutrons and electrons) in neutral atoms of four nuclides W, X, Y and Z. [table: columns 'number of nucleons' and 'total number of particles'; rows W 19 30, X 19 31, Y 21 32, Z 22 31] Which two nuclides are isotopes of each other?

1. AW and X
2. BW and Y
3. CX and Z
4. DY and Z

As printed in the paper