Promethium - Wikipedia Promethium is a chemical element; it has symbol Pm and atomic number 61 All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in the Earth's crust at any given time
Promethium(Pm) – Definition, Preparation, Properties, Uses . . . - Examples What is Promethium? Promethium is a chemical element with the symbol Pm and atomic number 61, making it one of the rare earth elements within the lanthanide series of the periodic table It is unique among the lanthanides as it does not occur in significant amounts in the earth’s crust in a natural, stable form due to its highly radioactive
Periodic Table of Elements: Los Alamos National Laboratory Promethium shows promise as a portable X-ray source, and it may become useful as a heat source to provide auxiliary power for space probes and satellites More than 30 promethium compounds have been prepared Most are colored
USA DOE Breakthrough in Promethium Chemistry Could Advance Rare Earth . . . In a major advance for rare earth science, researchers at Oak Ridge National Laboratory have successfully characterized a promethium coordination complex in solution for the first time, offering new insights into one of the rarest and most chemically elusive lanthanides
Promethium Promethium is the only rare earth radioactive metal In the dark, its salts luminesce with a pale blue or green glow due to its high radioactivity Isotope 147 Pm, the most useful isotope, decays with energetic gamma rays Promethium is useful as a beta source for thickness gauges