Deuterium

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Deuterium (symbol D, d) </dt>
A heavy isotope of hydrogen having one proton and one neutron in the nucleus. </dd>
The symbol D is often used to designate deuterium in compounds, as HDO for molecules of that composition. Official chemical nomenclature uses the designation d with a number which designates the carbon atom to which deuterium is bound; e.g. 2-d propane designates CH<math>₃</math>CHDCH<math>₃</math>. [[/a>|/a>]] </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use