3 articles
General
Chromium
Chromium is a hard, silvery transition metal with symbol Cr and atomic number 24, discovered by Louis Nicolas Vauquelin in 1798 and best known for making stainless steel stainless.
General
Copper
Copper is a reddish-gold metal, atomic number 29, the primary metal of the alloys brass and bronze, which gave the Bronze Age its name and today serves mostly in wiring and the power grid.
General
Group 11 element
A group 11 element, also called the copper or gold group, is one of four chemical elements: copper, silver, gold, and synthetic roentgenium, with copper, silver, and gold known as the coinage metals.