Several isotopes of a chemical element exist.
Which row in the table correctly compares the numbers of particles in neutral atoms of these isotopes?
Number of protonsNumber of neutronsNumber of electronsAdifferentthe samedifferentBthe samedifferentthe sameCthe samedifferentdifferentDdifferentdifferentthe same \begin{array}{|c|c|c|c|} \hline & \text{Number of protons} & \text{Number of neutrons} & \text{Number of electrons} \\ \hline \text{A} & \text{different} & \text{the same} & \text{different} \\ \hline \text{B} & \text{the same} & \text{different} & \text{the same} \\ \hline \text{C} & \text{the same} & \text{different} & \text{different} \\ \hline \text{D} & \text{different} & \text{different} & \text{the same} \\ \hline \end{array} ABCDNumber of protonsdifferentthe samethe samedifferentNumber of neutronsthe samedifferentdifferentdifferentNumber of electronsdifferentthe samedifferentthe sameRow A
Row B
Row C
Row D
284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.