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Beryllium is the chemical element in the periodic table that has the symbol Be and atomic number 4.

A toxic bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal, that is primarily used as a hardening agent in alloys (most notably beryllium copper).

Note:   The above text is excerpted from the Wikipedia article "Beryllium", which has been released under the GNU Free Documentation License.
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