promethium

美音音标: [prə'mi:θiəm] promethium
英音音标: [prə'mi:θiəm] result.0.expl|add:"

同义
atomic number 61 pm promethium
词性
n
解释
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
示例
None