Through animations of atoms of sodium and chlorine we see how an ionic bond is formed. We then see how gaining and losing electrons leads to positively and negatively charged ions. Only the formation of singularly charged ions is mentioned.We also find out that only metals and non-metals can form ionic compounds.

First broadcast:
21 November 2008

This clip could be used to introduce the concept of ionic bonding. Compare the nature of covalent and ionic bonds and discuss with students their understanding of these bonds. This could lead into investigation of the properties of covalent and ionic compounds, such as the strength of the bonds, state at room temperature and conductivity. After watching the clip, encourage students to draw atomic diagrams to show the formation of ions. Ensure students have a clear understanding that the metal ion will be positively charged and the non-metal ion will have a negative charge. Discuss the lattice structure of ionic compounds and ask students to explain why they only conduct electricity when molten or in solution.