A researcher records the electronic configurations of four atoms and the ions formed.
| element | electronic configuration of atom | ion formed |
|---|---|---|
| P | 2,12,12,1 | P+\mathrm{P^{+}}P+ |
| Q | 2,62,62,6 | Q2−\mathrm{Q^{2-}}Q2− |
| R | 2,8,22,8,22,8,2 | R2+\mathrm{R^{2+}}R2+ |
| S | 2,8,72,8,72,8,7 | S−\mathrm{S^{-}}S− |
Which pair of ions has exactly the same electronic configuration?
Q2−\mathrm{Q^{2-}}Q2− and R2+\mathrm{R^{2+}}R2+
P+\mathrm{P^{+}}P+ and S−\mathrm{S^{-}}S−
R2+\mathrm{R^{2+}}R2+ and S−\mathrm{S^{-}}S−
P+\mathrm{P^{+}}P+ and Q2−\mathrm{Q^{2-}}Q2−
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.