(Mythology: Prometheus, stole fire from heaven) Discovered in 1945 by Glendenin, Marinsky, Coryell. Prepared by fission of uranium or by neutron bombardment of Nm. From years of searching, it appears that there is no known Pm existing in the earth's crust. It has been found forming at the surface of the star Andromeda.
-- part contents for background part 23
----- text -----
rare earth metal, radioactive, 13 isotopes, salts luminesce due to radiation, isotopes 141 to 154, 145 is the longest living, two allotropic forms exist, can absorb and reproduce light
-- part contents for background part 24
----- text -----
beta form is used for thickness gages, used to convert light into electrical current, possible use as a portable x-ray unit, heat source for space probes and satellites