Potassium oxide contains potassium ions, K+\mathrm{K^{+}}K+, and oxide ions, O2−\mathrm{O^{2-}}O2−. Potassium has atomic number 19 and mass number 39. Oxygen has atomic number 8 and mass number 16.
| Ion | Number of protons | Number of neutrons | Number of electrons |
|---|---|---|---|
| K+\mathrm{K^{+}}K+ | 19 | ||
| O2−\mathrm{O^{2-}}O2− |
Complete the table.
119 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.