Group 7

Recall the distinct colours and physical states of chlorine, bromine, and iodine at room temperature.

Describe the periodic trends in the physical properties of halogens (chlorine, bromine, iodine) and apply these trends to predict the properties of other halogens.

Describe the standard chemical test used to identify chlorine gas.

Describe the chemical reactions of halogens with metals to form metal halides, and use this reactivity pattern to predict the behaviour of other halogens.

Understand that halogens form hydrogen halides that dissolve in water to produce acidic solutions, and predict similar reactions for other halogens.

Describe the relative reactivity of halogens through their displacement reactions with halide ions in aqueous solutions, and use this trend to predict the reactions of astatine.

Explain why halogen displacement reactions are classified as redox reactions by analyzing the gain and loss of electrons and identifying oxidized and reduced substances.

Explain the relative reactivity trends of the halogens using their electronic configurations.