(a(i))[3]
Complete the dot-and-cross diagrams in Fig. 3.2 to show the electronic configuration of a sodium ion and an oxide ion. Include the charges on the ions.
(a(ii))[1]
Write the formula for sodium oxide.
(b)[2]
Complete the dot-and-cross diagram in Fig. 3.3 so it shows the electronic configuration in a carbon dioxide molecule. Include only outer-shell electrons.
(c(i))[2]
Explain, in terms of bonding, why the melting point of sodium oxide is high.
(c(ii))[1]
Carbon dioxide melts at a low temperature. State the general term for the weak forces responsible for carbon dioxide's low melting point.