The liquidity of H2O is a necessary emergent property of its electrochemical structure. The electronegativity of oxygen is 3.5, and the electronegativity of hydrogen is 2.1. Electronegativity is the strength of attraction an atomic nucleus has for electrons. Since oxygen has a higher strength then hydrogen, electrons have a bias to orbit the oxygen atom for a longer duration than they orbit the hydrogen atom. This results in the oxygen atom having a bias for having extra negative charge floating around, where as the hydrogens have a bias for being barren of negativity, resulting in a mere positive charge. This causes H2O to be bipolar, negative on one side, positive on another side. This bipolar nature of H2O causes it to be attracted to itself, where all of the oxygens will search out the barren hydrogens. By being attracted to itself, it creates the phenomenon of liquidity.
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