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
Practise Edexcel GCSE Chemistry Ionic bonding with exam-style questions for Foundation and Higher tier. 42 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.