An ionic bond is a bond between a cation and an anion the ions of two different nonmetals valence electrons and cations the ions of two different metals

An ionic bond is a bond between a cation and an anion.

Explanation:

You can find the definition of ionic bond as the electrostatic force that bonds together the cations and anions in a ionic compound.

Cations are positively charged particles formed by the lack (loss) of electrons of the atoms.

Anions are negatively charged particles formed by the excess (gain) of electons of the atoms.

Therefore, being anions and cations particles with opposed charges, they will be attracted to each other by electrostatic force.

This electrostatic force that bonds together the cations and anions (particles with opposed charges) is named ionic bond.

The ionic bonds are typical of the cations formed by the metals, especially alkalyne metals (group 1 elements) and alkalyne earth metals (group 2 elements), with the anions formed by the non-metals, for instance oxygen (group 16) and halogens (group 17). The relative high difference in the electronegativities of these metals and non-metals permit that the metals transfer some few electrons to the non-metals, forming the respective cations and anions, which will result in the ionic bond between them.