Carolyn Krause presents the second part of the three-part series on the Oak Ridge National Laboratory's role in the discovery of elements in the periodic table. Many of them have been synthesized ...

"This is probably the first time these isotopes have existed on the surface of the Earth." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

For now, they're known by working names, like ununseptium and ununtrium — two of the four new chemical elements whose discovery has been officially verified. The elements with atomic numbers 113, 115, ...

THE first Friday evening discourse of the new session at the Royal Institution was delivered on November 2 by Dr. F. W. Aston, who took as his subject “Elements and Isotopes”. That a chemical element ...