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1. stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers).
Stoichiometric Defects. Defects in Stoichiometric Solids. It is generally known that all the compounds follow law of definite proportion. But there are certain solid compounds which, refuse to obey this universal law. Such solid compounds which actually do not possess the exact compositions according to the electronic considerations have been given the name Berthollide or non-stoichiometric compounds.