A stable isotope of hydrogen with a mass approximately twice that of the usual isotope. (Symbol: D)
- The most easily attained fusion reaction involves fusing nuclei of the two isotopes of hydrogen, deuterium and tritium, to make nuclei of helium.
- Although many nuclei can be fused, this subject normally refers to fusion of hydrogen isotopes deuterium or tritium to form helium.
- We know that for a fact because we've measured the isotope ratio of deuterium and hydrogen.
1930s: modern Latin, from Greek deuteros 'second'.
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