అర్థం : आवर्ती कोष्टकातील दूर्मिळ गटापैकी धातुरूप मूलद्रव्य.
ఉదాహరణ :
प्रोमेथिअमचा आणव क्रमांक एकसष्ठ आहे.
ఇతర భాషల్లోకి అనువాదం :
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.
atomic number 61, pm, promethium