The table gives information about particle X and ion Y.
| Particle | Information |
|---|---|
| particle X | relative mass 11840\dfrac{1}{1840}18401; relative charge +1 |
| ion Y | nucleus represented by 1226Mg{}^{26}_{12}\mathrm{Mg}1226Mg; overall relative charge +2 |
Give the name of particle X.
Explain how the mass of the nucleus of ion Y compares with the mass of particle X.
Calculate the number of neutrons in the nucleus of ion Y.
Calculate the electrons' contribution as a fraction of the total mass of ion Y.
Give your answer in standard form.
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.