来自MSN1 个月
Scientists Discovered Promethium in 1945. They Only Just Learned What It Actually Does.
Understanding Promethium and its bonding properties ... which is still quite a difficult task.” So while the Periodic Table of Elements may be a story about humanity’s chemical ingenuity ...
来自MSN10 个月
Oak Ridge National Laboratory credited with discovery of 3 elements in the periodic table
The periodic table included promethium and three newly discovered elements heavier than uranium - americium, curium and plutonium. Promethium, which has the symbol Pm, was the last rare-earth ...