Complete the dot-and-cross diagrams in Fig. 3.2 so they show the electronic configurations of one magnesium ion and one fluoride ion. Include the charges on the ions.
Deduce the chemical formula of magnesium fluoride.
State one further change that can be made to solid magnesium fluoride so that it can conduct electricity.
Complete the dot-and-cross diagram in Fig. 3.3 so it shows the electronic configuration in one molecule of silicon tetrachloride. Include only the outer shell electrons.
Silicon tetrachloride has a low melting point because the attractions between its particles are weak. Name the kind of particles held together by these weak forces of attraction.
Explain, in terms of structure and bonding, why silicon(IV) oxide has such a high melting point.