Promethium is a chemical element with the 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 Earth's crust at any given time.

Where is promethium found?

Promethium is not found in the Earth's crust. However, it can be observed in uranium ores as a product of uranium decay. In addition, it can be found in the Andromeda galaxy.

How do you get promethium?

Promethium is recovered from the leftovers of uranium fission. It can be produced by bombarding neodymium-146 with neutrons to become neodymium-147, which beta decays over its 11-day half-life into promethium-147, according to the Jefferson Laboratory. The primary use for promethium is for research.