Copper (Latin: cuprum) is an element with symbol Cu and atomic number of 29. Copper belong to a group called the transitional metal and is located on group 11 in the periodic table, possessing d-electron shells. It is a metal with high thermal and electrical conductivity. Copper can reach the oxidation state of -2, 0, +1, +2, +3, and +4, with +2 as the most common oxidation number of copper. Pure copper has a reddish-orange color, however, some observations suggested that copper in actuality has a yellow color. It was theorized that the reddish hue came from copper oxide, Cu2O, which forms easily in the air.1

Copper and its alloys have been used for thousand of years. It had been mined in the Romans era2 and the production of copper metal