(Solved): 3. a) Draw dot-cross diagrams to illustrate the bonding in the following substances: 3) Sodium oxid ...

3. a) Draw dot-cross diagrams to illustrate the bonding in the following substances: 3) Sodium oxide, $${\mathrm{Na}}_2\mathrm{O}$$ (4 marks) ii) Methane, $${\mathrm{CH}}_4$$ ( 3 marks) b) State the type of bonding present in each of the two compounds above. ( 2 marks) (N.B. For each substance, diagrams of the atoms before bonding must first be drawn. Then diagrams of the ions or molecules formed after bonding should follow.)