| 释义 |
pro·me·thi·um
\-thēəm\ noun
(-s)
Etymology: New Latin, from Prometheus + New Latin -ium
: a metallic element of the rare-earth group with no stable isotope occurring naturally that was discovered in radioactive form as a fission product of uranium, that has been obtained also from neutron-irradiated neodymium, and that shows chemical properties of other rare-earth elements — symbol Pm; see element table |