Water

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For more information see Biochemistry Online: Chapter 5D - Binding and the Control of Gene Transcription

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II. General Structure

Liquid Water
Ice - Oxygen atoms at positions in diamond lattice
Ice - with 1 chair drawn between O atoms. One H is between each O.  It is covalently attached to one of the O atoms (seen as white blur in red lines connecting the O atoms). The same H is H-bonded to the other connecting O atom.