Ion
An tom with an electric charge due to gain or loss of electrons.

Ionic bond
Atoms linked together by the attraction of unlike charges.

Ionization
Adding or subtracting electrons from an atom; alternatively, the dissociatoion of a solute into ions.

Isoelectronic
Refers to several dissimilar atoms or ions with identical electronic configurations.

Isomers
Several molecules with the same composition but different structures.

Isotope
A variety of an element characterizd by a specific number of neutrons in the nucleus.