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Definition of Atomic number 5
1. Noun. A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder.
Exact synonyms: B, Boron
Generic synonyms: Chemical Element, Element
Substance meronyms: Borax, Kernite
Derivative terms: Boric, Boronic
Generic synonyms: Chemical Element, Element
Substance meronyms: Borax, Kernite
Derivative terms: Boric, Boronic