 It is water. Bam! Two atoms of hydrogen, that's H2, on the periodic table. H2O, yeah. And one atom of oxygen is H2O. H2O. When you add all the extra words, it kind of camouflages it. H2O.20, yeah, okay. How many teeth does the average adult have? Not counting you, because you've got an overabundance. Yes, I do. Is it