Unstable decay This graphic plots the life spans, or half-lives, of the periodic table’s unstable elements (blue) on a logarithmic scale. Data for each element’s longest-lived form, or isotope ...

In other words, it contains elements not on the periodic table at all. These elements would be stable around atomic number 164, which is far denser that Osmium, the densest known naturally ...

Greetings from the island of enhanced stability: The quest for the limit of the periodic table Since the turn of the century, six new chemical elements have been discovered and subsequently added ...

Key Concepts The periodic table is a chart containing information about the atoms that make up all matter. An element is a substance made up of only one type of atom. The atomic number of an atom is ...

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 ...

The periodic table currently has 118 chemical elements (SN: 11/30/16). The five heaviest elements were all produced using a beam of calcium-48. That’s a variety, or isotope, of calcium with 28 ...

Such bombs, when they detonated, further filled out the periodic table. Starting in 1952, the United States blew up hydrogen bombs around the Marshall Islands.

Since the invention of the periodic table 150 years ago this month, scientists have worked to fill in the rows of elements and make sense of their properties.