Group 11 element

Group 11 in the periodic table
Name by element	copper group
Trivial name	coinage metals
CAS group number; (US, pattern A-B-A)	IB
old IUPAC number; (Europe, pattern A-B)	IB
↓ Period
4	Copper (Cu); 29 Transition metal
5	Silver (Ag); 47 Transition metal
6	Gold (Au); 79 Transition metal
7	Roentgenium (Rg); 111 unknown chemical properties
	primordial element
	synthetic element
	Atomic number color:
	black=solid

Group 11, by modern IUPAC numbering,^[1] is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), gold (Au), and roentgenium (Rg), although no chemical experiments have yet been carried out to confirm that roentgenium behaves like the heavier homologue to gold. Group 11 is also known as the coinage metals, due to their usage in minting coins^[2]—while the rise in metal prices mean that silver and gold are no longer used for circulating currency, remaining in use for bullion, copper remains a common metal in coins to date, either in the form of copper clad coinage or as part of the cupronickel alloy.^{[citation needed]} They were most likely the first three elements discovered.^[3] Copper, silver, and gold all occur naturally in elemental form.^[4]^[5]

^ Fluck, E. (1988). "New Notations in the Periodic Table" (PDF). Pure Appl. Chem. 60 (3). IUPAC: 431–436. doi:10.1351/pac198860030431. Retrieved 24 March 2012.
^ "23.6: Group 11: Copper, Silver, and Gold". Chemistry LibreTexts. 2015-01-18. Retrieved 2022-03-25.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1173. ISBN 978-0-08-037941-8.
^ "These Are the Native Elements That Occur in Nature". ThoughtCo. Retrieved 2022-03-25.
^ "List Native Elements Minerals & Naturally Occurring Metals In Pure Form". Mineral Processing & Metallurgy. 2016-09-27. Retrieved 2022-03-25.

[1] Fluck, E. (1988). "New Notations in the Periodic Table" (PDF). Pure Appl. Chem. 60 (3). IUPAC: 431–436. doi:10.1351/pac198860030431. Retrieved 24 March 2012.

[:0-2] "23.6: Group 11: Copper, Silver, and Gold". Chemistry LibreTexts. 2015-01-18. Retrieved 2022-03-25.

[GE-3] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1173. ISBN 978-0-08-037941-8.

[4] "These Are the Native Elements That Occur in Nature". ThoughtCo. Retrieved 2022-03-25.

[5] "List Native Elements Minerals & Naturally Occurring Metals In Pure Form". Mineral Processing & Metallurgy. 2016-09-27. Retrieved 2022-03-25.

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