What is the coordination no. of oxygen in water?
Based totally on the definition of the term it is 2, but it is generally not used in this way, it is only used when speaking about coordination between metals and ligands not in covalent bonds.
Previous answer is correct. But ...
If you include hydrogen bonds, then the coordination number of oxygen could be up to four. You have two regular OH bonds, but then you have two lone pairs of electrons that could engage in hydrogen bonding to other water molecules.
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