The U.S. Department of Energy first discovered einsteinium in 1952 in the fall-out of the first hydrogen bomb test. The element does not occur naturally on Earth and can only be produced in ...

Mendeleev’s periodic table, published in 1869, was a vertical chart that organized 63 known elements by atomic weight. This arrangement placed elements with similar properties into horizontal rows.

Researchers have gained new insights into the chemical properties of the superheavy element flerovium -- element 114 -- at the accelerator facilities of the GSI Helmholtzzentrum für ...