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Arsenic |
Arsenic
is a chemical element with the symbol
As and atomic number 33. Arsenic occurs
in many minerals, usually in combination
with sulfur and metals, but also as
a pure elemental crystal. Arsenic
is a metalloid. It has various allotropes,
but only the gray form, which has
a metallic appearance, is important
to industry.
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companies which make medicines |
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