Coccydynia is often caused by an injury, but it may occur seemingly spontaneously. There are many causes of tailbone pain that can mimic coccydynia, including sciatica, infection (including shingles of the buttocks), pilonidal cysts, sacroiliitis, and fractured bone (broken tailbone or tailbone fracture).
Characteristics: Curium is a hard, dense radioactive silvery-white metal. It tarnishes slowly in dry air at room temperature. Most compounds of trivalent curium are slightly yellow in color. Curium is highly radioactive and it glows red in the dark.
Yttrium is a soft, silvery metal. Yttrium usually exists as a trivalent ion, Y 3+ , in its compounds. Most of its compounds are colorless. Yttriumâs properties are very similar to those of the rare earth elements of the lanthanide series.