Two elements are represented by J and K.
The table gives information about the ions formed by these elements.
| ion | number of protons | number of electrons |
|---|---|---|
| J | 20 | 18 |
| K | 17 | 18 |
Give the formula of the ionic compound formed by J and K.
Explain your answer.
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.