What types of elements combine with each other will usually result formation of ionic bonding? Give an example.
An ionic bond is defined by a large difference in electronegativity. The difference in electronegativity causes the electron density to be centered much closer to one element than the other. This causes one element to have a "net" negative charge, while the other element has a "net" positive charge.
The only way to obtain a large difference in electronegativity is for one element ( usually an atom from the left side of the periodic table ) to have a low negativity while the other element ( usually a non metal from the right side of the periodic table) has a high electronegativity.