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n. A soft, brown, amorphous or crystalline nonmetallic element, extracted chiefly from kernite and borax and used in flares, propellant mixtures, nuclear reactor control elements, abrasives, and hard metallic alloys. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See Table at element.

n. The chemical element (symbol B) with an atomic number of 5; a metalloid

n. A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic number 5. Atomic weight 10.81. Symbol B.

n. Chemical symbol, B; atomic weight, 11. A chemical element belonging to the group of non-metals.

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

"My partner: Group 13 of the period table is called the boron group."

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kernite    ulexite    rasorite    tincal   

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