(a(i))[1]
produces an acidic solution in water
(a(ii))[1]
is monatomic
(a(iii))[1]
makes up 78% of clean dry air
(a(iv))[1]
is the principal component of natural gas
(a(v))[1]
contains 14 protons in each molecule.
(b(i))[1]
State the names of any two elements in the list.
(b(ii))[1]
What does the term element mean?
(c)[2]
Complete the dot-and-cross diagram so that it shows the electron arrangement in a molecule of hydrogen chloride. Show outer electrons only. The diagram has overlapping circles labelled H and Cl.