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Beryllium () is a chemical element with the symbol Be and atomic number 4.
A bivalent element, beryllium is a steel grey, strong, light-weight yet
brittle, alkaline earth metal. It is primarily used as a hardening agent in
alloys, most notably beryllium copper.
Properties
· It has one of the highest melting points of the light metals. The
modulus of elasticity of beryllium is approximately a third greater than
that of steel. It has excellent thermal conductivity and is nonmagnetic.
· It is highly permeable to X-rays, and neutrons are liberated when it is
hit by alpha particles, as from radium or polonium (about 30
neutrons/million alpha particles).
· At standard temperature and pressures beryllium resists oxidation when
exposed to air (although its ability to scratch glass is probably due to
the formation of a thin layer of the oxide). It resists attack by
concentrated nitric acid.
