Assigning oxidation numbers5/30/2023 Two electrons are lost and the sum of the oxidation states of the atoms increases by 2 units. In the conversion of water to 1/2 equivalent of molecular oxygen, we can see that the oxidation state of the oxygen atom changes from -II to 0. Overall, the addition of the 2 electrons causes the total of the oxidation states to decrease by 2 units. One of the carbons bonded to nitrogen goes from I to 0 oxidation state. ![]() The carbon that bonds to the additional proton goes from -I to -II in oxidation state. The oxidation state of the nitrogen atom doesn't change but 2 of the carbon atoms decrease in oxidation state. Let's look at the transformation of NADP to NADPH and focus on the 3 carbon atoms and the nitrogen atom that seem to change their bonds (in red).
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