Edexcel CC5a Ionic Bonds. This presentation usually takes about 3 or 4 lessons depending upon how quickly the students grasp the concept. It is worth spending time ensuring full comprehension as this is one of the fundamentals in chemistry. It starts by looking at how ions form, then moves onto drawing ions and ionic bonding diagrams ( dot and cross diagrams) Finally it ends by looking at charges on ions and how they link to the position in the Periodic Table. 3 differentiated worksheets are also included with this bundle.