light hydrogen

短语

[化] 氕 [医] 氢

释义与例句

n.
  1. 1.

    Synonym of protium (“"the usual isotope of hydrogen"”).

    不可数

词源

So named because it is the isotope of hydrogen with the lightest atomic weight and atomic mass, having one nucleon (a single proton and no neutrons).

来源：wiktionary