ATP break down and energy release?
A bond is formed between the oxygen of water and the phosphorus of the gamma-phosphate.  Here is a good link.

Bonds are both broken and made in chemical reactions but many biology teachers and textbooks state that &quot;Breaking ATP bonds releases energy.&quot;  In reactions bonds are broken and made.  If the strength of the bonds formed exceeds the strength of the bonds broken the reaction is exothermic. Under physiological conditions (with respect to pH and magnesium concentration), the reaction is exergonic as well (i.e. negative Gibbs free energy of reaction).