Group 11 element can also lead to the accumulation of these metals in body tissue; the results are the irreversible but apparently harmless pigmentation conditions known as chrysiasis and argyria respectively. Due to being short lived and radioactive, roentgenium has no biological use but it is likely extremely harmful due to its radioactivity. 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
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