Figure 1 shows the mass number and the atomic number for the nuclei of five different atoms, labeled V, W, X, Y, and Z.

Based on Figure 1:
How many neutrons are there in a nucleus of atom X?
Which two atoms represent the same chemical element?
Practise AQA GCSE Physics Atoms and isotopes with exam-style questions for Foundation and Higher tier. 6 questions covering The structure of an atom, Mass number, atomic number and isotopes, and The development of the model of the atom (common content with chemistry), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.