Periodic Table of the Elements Boron

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Periodic Table of the Elements: Boron

Periodic Table of the Elements: Boron

Atomic Number:	5
Atomic Symbol:	B
	Boron
Atomic Weight:	10.81
Electron Configuration:	2 · 3

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boron

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

boron (symbol B) Nonmetallic element of group III of the periodic table, first isolated in 1808 by English chemist Sir Humphry Davy. It occurs in several minerals, notably kernite (its chief ore) and borax. It has two allotropes: amorphous boron is an impure brown powder; metallic boron is a black to silver-grey hard crystalline material. It is used in semiconductor devices and the stable isotope B¹⁰ is a good neutron absorber, used in nuclear reactors and particle counters. Properties: at.no. 5; r.a.m. 10.81; r.d. 2.34 (cryst.), 2.37 (amorph.); m.p. 2079°C (3774°F); sublimes 2550°C (4622°F); most common isotope B¹¹ (80.22%).

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Free newspaper and magazine articles

	BORON BIOLOGICALS INC. Newspaper article from: BT Catalyst; 1/1/1993
	Borate Termite Treatment Enters Florida Market -- Offers Builders, Homebuyers Unparalleled Protection; Affordable, Long-Term Treatment Can Save Homeowners Thousands of Dollars. Business Wire; 1/22/2002
	DeBeers Industrial Diamonds changes its name. (Company News). Magazine article from: Metalworking Insiders' Report; 10/29/2002

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