Engelsk navneord: atomic number 61 | |||
1. | atomic number 61 (om masse el. substans) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium | ||
Termer med samme betydning (synonymer) | Pm, promethium | ||
Mindre specifikke termer | metal, metallic element | ||