The graph below shows a section of the chart of nuclides, plotting the neutron number, NNN, against the proton number, ZZZ, for five different nuclides labelled PPP, QQQ, RRR, SSS, and TTT.
Based on the graph:
Determine the mass number of nuclide RRR.
Identify which two nuclides represent isotopes of the same chemical element. Explain your choice.
Atoms and isotopes Questions
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.