ATOMIC NUMBER 5

 Dictionary entry overview: What does atomic number 5 mean? 

• ATOMIC NUMBER 5 (noun)
  The noun ATOMIC NUMBER 5 has 1 sense:

1. a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

  Familiarity information: ATOMIC NUMBER 5 used as a noun is very rare.

 Dictionary entry details 

• ATOMIC NUMBER 5 (noun)

Sense 1

Meaning:

A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

Classified under:

Nouns denoting substances

Synonyms:

atomic number 5; B; boron

Hypernyms ("atomic number 5" is a kind of...):

chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

Holonyms ("atomic number 5" is a substance of...):

borax (an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent)

kernite (a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron)

 Context examples 

An element with atomic symbol B, atomic number 5, and atomic weight 11.

(Boron, NCI Thesaurus)