Question

How are ionic bonds formed

Answer 1

Ionic bonds are formed by the transfer of valence electrons (those that can move free) between certain type of atoms, these exchange generates two iconic atoms with opposite charge.

So, basically, the transfer of this electrons is how is formed.

Answer 2

Ionic bonds are formed when a cation and an anion transfer electrons. The anion gains electrons from the cation to finish its shell, and is usually a nonmetal or a metalloid. A cation gives the anion its electrons to get rid of its partial shell. Cations are metals.