Abstract
A simple criterion is developed for ordering the bond strengths of isoelectronic hydrides, particularly positive ions with the formula MZ+1Hn+ and the corresponding neutral molecules MZHn. For monohydrides the criterion states that the bond strength of the ion will be greater than that of the neutral molecule whenever the ionization potential of the atom MZ+1 is less than 13.6 eV. When this ionization potential is significantly greater than 13.6 eV the neutral molecule has the stronger bond. For polyhydrides the total dissociation energy of the ion is almost always greater than that of the neutral molecule. Extensive experimental evidence in support of this criterion is presented.
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