1.32 Explain, using dot and cross diagrams, the formation of ionic compounds by electron transfer, limited to combinations of elements from Groups 1, 2, 3 and 5, 6, 7

Atoms react, bonding with each other, in an attempt to fill their outer shell. Full outer shells mean that the atom is stable. Ionic bonding involves oppositely charged atoms being formed due to a gain/loss of electrons.

I.e.

Figure 1: Drawn by me, all shells showing

Figure 2: Drawn by me, only outer shells showing