atomic number 5 atomic number 49 • atomic number 50 · · · Info · Definitions · Synonyms · Characters · · atomic number 5 · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder. Synonyms: boron, B, atomic number 5. · · Noun Definition 1 Synonyms · · · boron · · Synonym 1 b · · Synonym 2 Characters · · space U+0020 5 digit five U+0035 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