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more about boron
boron |
4 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Boron \Bo"ron\ (b[=o]"r[o^]n), n. [See {Borax}.] (Chem.) 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 weight 10.9. Symbol B. From WordNet r 1.6 [wn]: boron n : a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder [syn: {B}, {atomic number 5}] From U.S. Gazetteer (1990) [gazetteer]: Boron, CA (CDP, FIPS 7568) Location: 35.00492 N, 117.65034 W Population (1990): 2101 (937 housing units) Area: 7.6 sq km (land), 0.0 sq km (water) Zip code(s): 93516 From Elements database 20001107 [elements]: boron Symbol: B Atomic number: 5 Atomic weight: 10.811 An element of group 13 of the periodic table. There are two allotropes, amorphous boron is a brown power, but metallic boron is black. The metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room temperatures. It is never found free in nature. Boron-10 is used in nuclear reactor control rods and shields. It was discovered in 1808 by Sir Humphry Davy and by J.L. Gay-Lussac and L.J. Thenard.
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