(a(i))[3]
Explain, using structure and bonding, why diamond and iodine have different melting points.
(a(ii))[2]
Explain, using structure and bonding, why calcium and iodine differ in electrical conductivity.
(b)[2]
Diamond and graphite are different forms of carbon. Explain, in terms of structure, why graphite is used as a lubricant.
(c)[2]
A compound containing sodium, iodine and oxygen has $11.62\%$ sodium, $64.14\%$ iodine and $24.24\%$ oxygen by mass. Deduce the empirical formula of this compound.