6
29 47 26 28 82 14
.999922 .000070 .000002 .000002 .000002 .000002
8.96
C

From Goodfellows 1995-96 catalogue:
A wide range of forms and purities is available. Microfoils as
thin at .0025micron, foils in the micron range, and bulk materials.
The high purity foils are rated 99.99+ % purity and contain mainly
Ag as the impurity. The above composition is based on this composition.
The is a high purity lump available at 99.999+. As expected much
is available at lesser purity.

Copper is a reddish colored metal which is malleable and ductile.
It has excellent thermal and electrical conductivities and good
corrosion resistance.  It is found in sulfide ores and as carbonate,
arsenide and chloride (abundance in the Earth's crust is 50 ppm).
Extraction of the metal involves roasting the ore to produce the
oxide, followed by reduction and purification by electrolysis. 
The element is inert to non-oxidising acids but reacts with 
oxidising agents. In air, it will weather to produce the characteristic
green patina of the carbonate.  Copper will combine with oxygen on
heating to produce CuO at red heat and Cu2O at elevated heat.

Pure copper has an electrical conductivity second only to that of
silver and hence its main application is in the electrica industry.
Copper is also the basis of many important alloys (e.g. brass, bronze,
and aluminum bronze) and has been traditionally considered to be one
of the main coinage metals, along with silver and gold, but being
more common, is the least valued. It is one of the first metals ever to
have been worked by man and is thought to have been mined for more than
5000 years.
