The table shows the particles in two neutral atoms.
| Atom | Protons | Neutrons | Electrons |
|---|---|---|---|
| P | 6 | 6 | 6 |
| Q | 6 | 8 | 6 |
The relative masses of a proton and a neutron are both 1. Ignore electron mass.
Which gives the difference in relative mass and the difference in total charge between the atoms?
Mass difference 0; charge difference 2
Mass difference 2; charge difference 0
Mass difference 0; charge difference 0
Mass difference 2; charge difference 2
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.