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Additional
Rhenium
English Wikipedia - The Free Encyclopedia
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Rhenium
Rhenium
is a
chemical element
with symbol
Re
and
atomic number
75. It is a silvery-white, heavy, third-row
transition metal
in
group 7
of the
periodic table
. With an
estimated
average concentration of 1
part per billion
(ppb), rhenium is one of the rarest elements in the
Earth's crust
. The free element has the
third-highest
melting point
and highest boiling point of any element, at . Rhenium resembles
manganese
and
technetium
chemically and is obtained as a
by-product
of
molybdenum
and
copper
ore's extraction and refinement. Rhenium shows in its compounds a wide variety of
oxidation states
ranging from -1 to +7.
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