Engelsk substantiv: promethium | |||
| 1. | promethium (om masse eller 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 | ||
| Ord med samme betydning (synonymer) | atomic number 61, Pm | ||
| Mindre spesifikke uttrykk | metal, metallic element | ||