Calcium oxide has the formula CaO\text{CaO}CaO.
Calcium oxide contains Ca2+\text{Ca}^{2+}Ca2+ and O2−\text{O}^{2-}O2− ions.
The atomic number of calcium is 20.
What is the electronic configuration of the Ca2+\text{Ca}^{2+}Ca2+ ion?
2.8.82.8.82.8.8
2.8.8.22.8.8.22.8.8.2
2.8.102.8.102.8.10
2.8.62.8.62.8.6
32 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.