There’s no debating that metallic sodium is exciting stuff, but getting your hands on some can be problematic, what with the need to ship it in a mineral oil bath to keep it from exploding.

A small piece of sodium metal is placed in a flask of chlorine gas ... The +2 calcium ion and the two -1 chloride ions attract each other and form an ionic bond and the compound calcium chloride. One ...

A dot and cross diagram for sodium chloride suggests that it is ... 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.