promethium是什么意思_promethium用英语怎么说_promethium的翻译_promethium翻译成_promethium的中文意思_promethium怎么读,promethium的读音,promethium的用法,promethium的例句

Noun

• 1. 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