A neutral atom has 16 protons and 18 neutrons. The atom loses two electrons to form an ion.
The table shows the relative mass of each type of particle in the ion.
| Particle | Relative mass |
|---|---|
| proton | 1 |
| neutron | 1 |
| electron | 11840\displaystyle \frac{1}{1840}18401 |
Calculate the percentage of the total relative mass of the ion that is due to its electrons.
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.