International Team of Scientists Led by Carnegie Mellon Chemistry Professor Verifies the Discovery of Four New Elements-CMU News - Carnegie Mellon University

Thursday, January 7, 2016

International Team of Scientists Led by Carnegie Mellon Chemistry Professor Verifies the Discovery of Four New Elements

The Joint Working Party for the Discovery of New Elements approves elements 113, 115, 117 and 118 for inclusion in the periodic table

By Amy Laird / 412-268-8619 / apavlak@andrew.cmu.edu

elements

The seventh row of the periodic table of the elements is finally complete. The Joint Working Party for the Discovery of New Elements, chaired by Paul Karol, a Carnegie Mellon University professor emeritus of chemistry, has confirmed the discovery of four new elements — 113, 115, 117 and 118 — that fill in the table's seventh row.

The scientists from the United States, Japan and Russia who discovered the elements now have the go-ahead to name them. According to the International Union of Pure and Applied Chemistry, new elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist.

Over the past several years the element-hunting scientists have published many papers about their work. The Joint Working Party for the Discovery of New Elements (JWP) was tasked with assessing the claims of elemental discovery according to criteria established in 1999. Those criteria were instituted as a means to adjudicate competing claims for discovery following a contentious period known as the "transfermium wars" — a decades-long battle over who discovered and therefore had the right to name elements 104-109.

In 2012, the JWP began evaluating the evidence surrounding the discovery of elements 113, 115, 117 and 118. A joint effort between the International Union of Pure and Applied Chemistry and the International Union of Pure and Applied Physics, the JWP verified that the scientists did indeed discover four new elements.

"Each successive element becomes more and more difficult to synthesize and increasingly difficult to measure," Karol said. "To actually study the chemistry is a profound challenge to the cleverness of experimental and theoretical scientists."

Karol, a nuclear chemist who retired in 2012 after 43 years as a Mellon College of Science faculty member, has chaired the JWP since its inception in 1999. In the last 15 years, the group has conferred elemental status to five other elements: darmstadtium, roentgenium, copernicium, flerovium and livermorium.

The discovery and naming of an element is held in high esteem. When American chemist Glenn Seaborg learned that element 106 would be named "seaborgium" in his honor, he said that such a tribute meant more to him than his Nobel Prize award.

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