Tìm kiếm
Promethium
01
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
Ví dụ
Từ Gần
Tải Ứng Dụng
Download Mobile App
Tìm kiếm
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