fermium

The team studied less than 2 billionths of a gram of fermium painstakingly produced by Oak Ridge (Tenn.) National Laboratory and then flown to Germany.

After the war, Seaborg and his colleagues continued their research on the transuranium elements, discovering such elements as berkelium, californium, einsteinium, fermium, mendelevium, and nobelium.

I may know that I believe that Einsteinium is an element and know that I believe that Fermium is an element, but I may wonder whether these two beliefs are really just one, partially on account of the possibility that "Fermium" is just another name for Einsteinium.

They were eventually named, respectively, einsteinium and fermium in honor of Albert Einstein and Enrico Fermi, who had died in the months preceding laboratory study of the elements.

"The idea that an element has never been named after a living scientist is incorrect, since elements 99 and 100 were named einsteinium and fermium while Einstein and Fermi were alive, though the names were not sanctioned officially until after they had died.