Hospitals store oxygen gas, O2\mathrm{O_{2}}O2, in cylinders. Oxygen has atomic number 8.
State the type of covalent bond between the two atoms in an oxygen molecule. Choose from: single, double, triple.
Explain why two oxygen atoms share two pairs of electrons when they form an oxygen molecule.
Determine the total number of outer shell electrons in an oxygen molecule that are not used in bonding.
Water, H2O\mathrm{H_{2}O}H2O, is also made of molecules. Compare the bonding in an oxygen molecule with the bonding in a water 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.