A Group 11 element is one in the series of elements in group 11 (IUPAC style) in the periodic table, consisting of transition metals copper (Cu), silver (Ag), and gold (Au). Roentgenium (Rg) belongs to this group of elements based on its theoretical electronic configuration, but it is a short-lived transactinide with a 22.8 seconds half-life that has only been observed in laboratory conditions. Although at various times societies have used other metals in coinage including aluminium, lead, nickel, stainless steel, tin, and zinc, the name "coinage metals" is used to highlight the special physio-chemical properties that make this series of metals uniquely well suited for monetary purposes. These properties include ease of identification, resistance to tarnish, extreme difficulty in counterfeiting, durability, fungibility and a reliable store of value unmatched by any other metals known.
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