The word "Ionic" refers to a condition where a particle has an electric charge. In the case of colloidal silver made with a typical battery or A/C operated colloidal silver generator, this electric charge is ALWAYS positive. Silver will not form a negatively charged ion.
So, the truth is that colloidal silver is BOTH colloidal and Ionic. It is considered colloidal because of the particle SIZE and it is considered Ionic because of the positive particle CHARGE.
In fact, a large number of the biological studies done over the years suggest it is colloidal silver's Ionic characteristics that make it such a good germicide. It is also interesting to note that old chemistry books make no distinction between the colloidal and ionic states of colloidal metals.