Uranium is a naturally occurring radioactive element, which has the atomic number of 92 and corresponds to the chemical symbol U in the periodic table. It belongs to a special group of elements called ...

By 1939, 91 elements were known to exist, including uranium, which has 92 protons in each nucleus and, at the time, the highest atomic number in the periodic table. But element 61 was still not known ...

The periodic table, also called the periodic table of ... For elements 93-118, which are lab-created trans-uranium elements (elements beyond uranium, which has an atomic number of 92), there ...

For the last fifty or so years, the periodic table has been incomplete. Elements after uranium on the periodic table have been synthesized for the past few decades, but there were always a few ...

Science had at last discovered the final natural element, completing the periodic table after almost a century of work, and few seemed to care. What happened? Advertisement Uranium and plutonium ...

“The periodic table,” wrote the chemist Peter Atkins ... produced several new elements with atomic numbers beyond uranium, the last naturally occurring element in the table.

Generally for the elements after uranium, the further along they are on the periodic table — the higher their atomic number — the less time they last. Half-lives of unstable elements vary by ...

For example, uranium (element 92) gradually decays into a whole series of lighter elements, ending with lead (element 82). 6. How is the modern periodic table arranged? Now we sort elements by their ...

“The discovery provides new understanding of how berkelium and other actinides behave relative to their peers in the periodic ...

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 ... atomic mass ...