Look at Structure A and Structure B represented in the diagram below.
a.[2]
(i) Identify the type of bonding in Structure A. Explain how this bonding arises.
b.[2]
(ii) Explain, in terms of structure and bonding, why substances with Structure A have extremely high melting points.
c.[2]
(iii) Explain why Structure A does not conduct electricity when solid, but does conduct electricity when molten.
d.[2]
Explain, in terms of structure and bonding, why metals (represented by Structure B) are malleable.