Final answer:
For each group mentioned, the number of unpaired electrons can be determined by considering their electron gain or loss.
Step-by-step explanation:
(a) Elements of group 1 need to lose one electron, elements of group 14 need to gain 4 electrons, and elements of group 17 need to gain 1 electron.
(b) Elements of group 1 need to lose 1 electron, elements of group 14 and 17 need to gain 1 electron each.
(c) Elements of group 1 need to lose 2 electrons, elements of group 14 need to gain 4 electrons, and elements of group 17 need to gain 1 electron.
(d) Elements of group 1 need to gain 1 electron, elements of group 14 need to lose 4 electrons, and elements of group 17 need to lose 1 electron.