An ionic bond is found between a metal and a non-metal, or a cation and anion. The metal always gives electrons away, and the non-metal always gains electrons. So in the bond for lithium chloride, the lithium ion gives away one electron (giving it a 1+ oxidation number) and the chloride ion takes the electron (giving it a 1- oxidation number) so the chemical formula is written as a 1:1 ratio, since they give and take the same number of electrons. The chemical formula is written as LiCl. This gives you 1 - lithium and 1- chlorine.
