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An H2O ice molecule obeying the 'ice rules' The 'ice rules': (also called the Bernal–Fowler rules [766]) each water molecule (right labeled 'a') has four hydrogen-bonded neighbors, two hydrogen atoms near each oxygen (~1 Å), one hydrogen atom on each O····O bond; thus H-O-H···OH2 and H2O···H-O-H

H3O+.3(H2O) hydtated oxonium ion

Ice-ten cubic structure consisting of 8 unit cells of two water molecules plus extra atoms found within the basic cubic structure