Group 11 element Group 11 element Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au). Roentgenium (Rg) is also placed in this group in the periodic table, although no chemical experiments have yet been carried out to confirm that it behaves like the heavier homologue to gold. Group 11 is also known as the "coinage metals", due to their former usage. They were most likely the first three elements discovered. Copper, silver, and gold all occur naturally in elemental form. All the elements of the group except
CU convoys anti-submarine screens for CU convoys because the s of the British and Canadian Mid-Ocean Escort Force were not fast enough to maneuver with these convoys. Nine tankers departed Curaçao as convoy CU 1 on 20 March 1943 and arrived in Liverpool on 1 April. Additional sailings from Curaçao were CU 2 in June, CU 3 in July, CU 4 in September, and CU 6 in November. Convoy CU 5 was the first to originate in New York on 13 October 1943. Approximately three or four CU convoys sailed from New York each month from December 1943 through May 1945. Convoys