protium

Etymology

proto- + -ium. From Ancient Greek πρῶτος (prôtos, “first”)

noun

  1. (physics) The lightest and most common isotope of hydrogen, having a single proton and no neutrons: ¹₁H
    So far there are no differences among the protiums extracted at various labs, except for concentration levels.
  2. An atom of this isotope.

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