Calcium becomes a +2 ion and each chlorine becomes a -1 ion. The +2 calcium ion and the two -1 chloride ions attract each other and form an ionic bond and the compound calcium chloride. One calcium ...

These models usually use coloured balls to represent the ions. Some use sticks to show the ionic bonds. A 3D construction model still has limitations: A 3D model may be drawn as a 3D diagram.