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H (hydrogen) is a single element, and H2O (water) is 3 atoms connected together. In H2O they form bonds with each other, the Lewis structure of H20 is a H single bonded to an O which has to non-bonded p[airs on it that is single bonded to another H. H by itself is bonded to no other element. H is a gas, H20 is a liquid.

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16y ago

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