1 The list below shows the formulae of six compounds. From the list choose the three ionic compounds.
LiCI Cs, NH, BaBr, CO, NaH
2 Draw dot-and-cross diagrams for the three ionic compounds you have chosen.
3 Why do Group 1 elements form 1+ ions?
4 Give the formula of the sulfide ion.
5 Why do the ions in NaCI stay together?
6 What are the formulae of the ionic compounds potassium sulfide and magnesium iodide?
