atomic number 1 atomic number • atomic number 10 · · · Info · Definitions · Synonyms · Characters · · atomic number 1 · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe. Synonyms: hydrogen, H, atomic number 1. · · Noun Definition 1 Synonyms · · · hydrogen · · Synonym 1 h · · Synonym 2 Characters · · space U+0020 1 digit one U+0031 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075