(a(i))[1]
State what the term diatomic means.
(a(ii))[1]
State the percentage of nitrogen present in clean, dry air.
(b)[2]
Ammonia has a simple molecular structure. Complete Fig. 2.1 to display the dot-and-cross diagram for one molecule of ammonia. Show only the outer-shell electrons.
(c(i))[1]
Sodium chloride has a giant ionic structure made of positive and negative ions. State the general term used for any positive ion.
(c(ii))[1]
State one physical property shown by an ionic compound.
(d(i))[1]
Graphite is used as an electrode. State one additional use of graphite.
(d(ii))[1]
Choose the statement that best describes the structure and bonding in graphite. Tick one box: simple covalent molecule; giant ionic; simple ionic; giant covalent.