The electronic configuration of some elements is given in the table below.
|P||2, 8, 8|
|Q||2, 8, 8, 1|
|T||2, 8, 2|
|U||2, 8, 7|
(a) Identify any two pairs of elements that will react to form compounds by a transfer of electrons.
(b) Write the molecular formula of the compounds formed by the pairs of elements identified in (a).