Substances that consist of covalent molecules are usually gases or liquids at room temperature. Ionic bonds are formed between a metal and non-metal, for example, sodium chloride. Outer electrons ...

A little water helps expose the sodium so it can react with the chlorine gas. The reaction releases a lot of heat as the ionic compound sodium chloride is formed. A sodium and chlorine atom are near ...

They form ions which bond to form sodium chloride. 2. Work out how many electrons ... and cross diagrams for the formation of ions in some ionic compounds – magnesium oxide and calcium chloride.