Neptunium, element 93 on the periodic table of elements, was the first transuranium element to be produced synthetically and the first actinide series transuranium element to be discovered. Its ...

Hafnium is a lustrous, silvery-gray transition metal. Discovered in 1923, it was the next-to-last element with stable nuclei to be added to the periodic table (the final one was rhenium in 1925).

Background Plants that accumulate metal and metalloid trace elements to extraordinarily high concentrations in their living biomass have inspired much research worldwide during the last decades.

Select an option below to continue reading this premium story. Already a Honolulu Star-Advertiser subscriber? Log in now to continue reading. During the 1940s the Manhattan Project adapted the methods ...