Write down the electronic configuration of a bromine atom.

Explain which element is oxidised and which is reduced in this reaction:

$2\mathrm{Fe}\left(\mathrm{s}\right) + 3{\mathrm{Cl}}_2\left(\mathrm{g}\right) \to 2{\mathrm{FeCl}}_3 \left(\mathrm{s}\right)$

Draw a dot-and-cross diagram to show the covalent bonding in a chlorine molecule, ${\mathrm{Cl}}_2$. Only include outer shell electrons.

Discuss with another learner or group of learners, do you believe that the uses of halogens and their compounds have had a positive or negative effect on the world, overall?