Extra energy is required to make the phospho-anhydride bond in ATP. One of the r

Question

Extra energy is required to make the phospho-anhydride bond in ATP. One of the reasons is the resonance stability. Fromwhat I know, resonance allows electrons to move about to spread outthe energy load. Since ATP has 3 phosphate groups attached tothe ribose, I am assuming there are 7 resonance structures I coulddraw from delocalisation of electrons. Since there are more resonance structures in ATP than in ADP,ATP should therefore be more stable than ADP and AMP. However, in my lecture notes it says ATP is resonanceunstable, thus the extra energy needed. I do not understandhow ATP is more resonance unstable compared to ADP and AMP.
Please help explain and correct me if I'm wrong. Thankyou. Since there are more resonance structures in ATP than in ADP,ATP should therefore be more stable than ADP and AMP. However, in my lecture notes it says ATP is resonanceunstable, thus the extra energy needed. I do not understandhow ATP is more resonance unstable compared to ADP and AMP.
Please help explain and correct me if I'm wrong. Thankyou.

Explanation / Answer

the resonance part is a minor contributor to the reason energy is req'd to make a phosphoanhydride bond, the major energy requirements comes from the fact that phosphate groups are negatively charged and don't like to be next to each other, so think about it this way ADP is more stable because it has less negative charges next to each other

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