I just learned that about 1/1000 of hydrogen is deuterium. Does that mean 1/1000 of water is D2O, which is heavier and sinks to the bottom in a glass of water? And consequently is there a layer of D2O at the bottom of the ocean? thanks!
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It's rarer than that, more like 1 in 6000. Because each molecule of water has two atoms of hydrogen, then about every 2 in 6000 (1 in 3000) has a single atom of deuterium (DHO). And would be closer to 1 in every 6000$^2$ for a molecule of D2O.
The linked question Deuterium density in seawater gives sources that show deuterium is well-mixed in the ocean. The difference in weight between D2O and H2O is similar to the difference in weight of N2 and O2. Currents, turbulence, and diffusion are sufficient to keep those molecules well distributed in our atmosphere, so I would not expect separation of D2O to occur spontaneously in water.
