Promethium (atomic number 61, symbol Pm) is a metal that rarely occurs in nature. It is an artificially produced and radioactive element and earth metal. It can be obtained from fission products of other elements, including plutonium, thorium, and uranium. The element is found in very small amounts in the composition of uranium ores. Astronomers have observed promethium in the spectra of stars that belong to the Andromeda galaxy.
This element is paramagnetic and has 9 isotopes and hexagonal crystal structure. Its electronegativity according to Pauling, ionic radius, and Van Der Waals radius are unknown. The metal is in solid...Read More