Copper has a brownish red colour.
For comparison, aluminum has a density of 2.7, iron 7.9, lead 11.3 and gold 19.3. Its atomic number is 29 and atomic weight 63.54. Its chemical symbol is Cu which is an abbreviation of its Latin name, cuprum. Copper's most notable quality is its electrical conductivity which is far above that of other base metals and iron. Only silver marginally exceeds it.