Chlorine, Cl2\mathrm{Cl_{2}}Cl2, is used to kill bacteria in drinking water. Chlorine has atomic number 17.
Give the electronic configuration of a chlorine atom.
Explain why two chlorine atoms join together with a single covalent bond.
A student draws a dot-and-cross diagram of a chlorine molecule. The diagram shows two shared pairs of electrons between the two atoms and two non-bonding pairs of electrons on each atom. Explain what is wrong with the student's diagram and describe the correct diagram.
Hydrogen chloride, HCl, is made when hydrogen reacts with chlorine. Compare the bonding in a chlorine molecule with the bonding in a hydrogen chloride molecule.
53 exam-style questions on Edexcel GCSE Chemistry 2.4 Covalent bonding, covering 2.4.1 Covalent bonding and simple molecules. Each one has a worked solution and a mark scheme showing where the marks go.