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
The Cu Bird Cu bird is dressed, it flies to better lands, and the other birds blame the hoot owl. This is why the latter calls at night to the Cu bird, "Ticú-ticú", and why it cannot see during the day. There is a song titled "El pájaro cu" in the Mexican Son Jarocho style. According to one source, "pájaro cu" is a name used in the Yucatan Peninsula for the russet-crowned motmot, a colorful bird. The Cu Bird The Cu bird (Spanish: "pájaro cu" or "cú") is a bird from a Mexican folktale that is unhappy with its looks. According to the