Print metal/ligand slides. Give each student/pair one page with a transition metal and a ligand. They must: a) make model using matchsticks, plasticine and stickers to label atom/ion groups. b) draw the diagram c) write out the formula d) state the coordination number e) state whether the ligand is unidentate, bidentate etc. f) determine the shape Once they have completed they leave the model for others to use and then complete b-f for the circus of ions (some may be more difficult than others and may require advice!). This could be best done in a table.