(a(i))[3]
Use ideas about structure and bonding to explain why magnesium and phosphorus have different melting points.
(a(ii))[2]
Use ideas about structure and bonding to explain why graphite and phosphorus differ in electrical conductivity.
(b)[2]
Diamond and graphite are two distinct forms of carbon.\n\nExplain, in terms of its structure and bonding, why diamond is chosen for cutting tools.
(c)[2]
A compound made from phosphorus, oxygen and chlorine contains $20.2\%$ phosphorus, $10.4\%$ oxygen and $69.4\%$ chlorine by mass.\n\nDeduce the empirical formula of this compound.