protiumWiktionary 原文构词拆分proto-前缀An early, primitive stage of development. · Original, older.+-ium后缀(chemistry) Used to form the names of metal elements, after the style of early-named elements, as well as the isotopes of hydrogen. · (chemistry) Used to form the temporary systematic element name of a metallic or nonmetallic演变路径（由近及远）英语源自 ←古希腊语 πρῶτος “first”词源说明From proto- + -ium. From Ancient Greek πρῶτος (prôtos, “first”).释义（英文）名词 Noun(physics) The lightest and most common isotope of hydrogen, having a single proton and no neutrons: 11H. It is the only stable nuclide