(b) Group 7 (halogens) – chlorine, bromine and iodine

Know the colours, physical states (at room temperature) and trends in physical properties of these elements

Use knowledge of trends in Group 7 to predict the properties of other halogens

Understand how displacement reactions involving halogens and halides provide evidence for the trend in reactivity in Group 7

Explain the trend in reactivity in Group 7 in terms of electronic configurations