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On the one hand, the chemistry is clear: The highly unstable pure sodium or potassium wants to lose an electron, and this splits the water atom, producing a negatively charged hydroxide ion and hydrogen and forming an explosive gas that ignites.

The substrate-generated hydroxide ion attacks the γ-phosphate, either concerted with the proton transfer or in a stepwise mechanism leading to GTP hydrolysis.

Yes, this is an ion, but is it just an ion or a hydroxide ion?