I think this woukd refer to a single monatomic oxygen atom that has taken two extra electrons, and hence, will be somewhat stabke with a full outer shell. In this way I think that in theory we coukd see O(2-). Oxygen would have seven electrons in its orbital flux aura, one away from having an octet and a complete shell. (Some might argue that oxygen might be pulling hydrogen's electron a bit closer to itself for a few physical reasons, and hence 'winning' - but the match has not ended, so no one can be declared a winner or loser, a taker of electrons, hence no charge, (as a prize or show of strength), can yet be denoted. In this OH or HO bond, neither atom has lost an electron. When they bond, they each give eachother a valence electron. because if I think simply yet logically, if I take a neutral atomic O, and a neutral atomic H and make them bond, I don't think we actually have an overall formal charge. So if ai am correct, without this backstory or creation story for OH- or HO-, it is not intuitive. (On another level however, I think this stolen electron would be whizzing around near the H in OH too, hence some negative charge of this electron woukd be exerting itself over the H in the OH from time to time. (Note, the H in OH is not carrying the stolen electron but the negative charge symbol is written by it, though we could write HO- to be more clear. So the oxygen had an extra electron, torn from the hydrogen now detached.īut because there is an H still attached we write OH. The other hydrogen stayed attached to the oxygen. This hydrogen was sent loose, without an electron to help it make another bond or be useful by sharing its bond making electron with another element. Oxygen turned out to be stronger and yanked away the only electron one of the hydrogens had. The oxygen had 2 electrons to help out the hydrogens, one for each.īut when the water molecule split apart, there was a tug of war over their shared electrons. What I mean is O and H and H came together to form water, amd did so by sharing electrons.Īt this point, before they arrived together and during, even the hydrogens had 1 electron each to give to help oxygen. If we say OH- formed from the dissociation of H2O into H+ and OH-, then there is some sense. Without a backstory of how it came to form, I don't think the negative formal charge makes intuituve sense.
I may be wrong, but one way I understood the overall formal charge denoted outside the bracketed OH- molecule, was by giving OH- a backstory. Hydrogen exists as $\ce$, a very stable compound we know as water.
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