1. What is Promethium?...
Promethium is a chemical element with symbol *Pm* and atomic number of 61. promethium was the last of the rare earth lanthanide elements to be discovered.

2. In 1945 firm evidence that element 61 had been isolated was produced by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell, at Oak Ridge, Tennessee, who produced it from fission products of uranium

3. Where is the name came from?...
They named the element promethium, which was accepted in 1949 for the international union of pure and applied chemistry.
The name comes from the greek Titan Prometheus who in greek mythology stole fire from mount Olympus to give to mankind.

4. Where is it found?
It is found in miniscule amounts in uranium ores as a product of uranium decay. Promethium can be produced as a product of uranium fission.
Usages: Promethium is useful as a beta source for thickness gauges and atomic batteries for spacecraft and guided missiles.