(a(i))[1]
Which element exists as single atoms in the gaseous state?
(a(ii))[1]
Which element accounts for 78% of dry air?
(a(iii))[1]
Which element has an oxide that reacts with blast furnace impurities to make slag?
(a(iv))[1]
Which element forms aqueous ions with a $2+$ charge that give a dark blue solution when excess aqueous ammonia is added?
(a(v))[1]
Which element reacts with propane in the presence of ultraviolet light through substitution?
(b)[4]
Complete the table to show the electron number and neutron number for the sulfur atom and the magnesium ion.