Copper
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Copper is a chemical element; it has symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure co
A copper disc (99.95% pure) made by continuous casting; etched to reveal crystallites
Unoxidized copper wire (left) and oxidized copper wire (right)
The East Tower of the Royal Observatory, Edinburgh; the original copper was installed in 1894 and the refurbished copper in 1994
Cobalt
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Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of
A block of electrolytically refined cobalt (99.9% purity) cut from a large plate
Cobalt tool tip
Cobalt(II) chloride hexahydrate