During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

 An electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane. This creates an electrochemical proton gradient that drives the synthesis of adenosine triphosphate (ATP), a molecule that stores energy chemically in the form of highly strained bonds. In most organisms the majority of ATP is generated in electron transport chains.