Livermorium: First Synthesis, Isotopes, and Community Recognition at Livermore

Periodic Videos discusses the first creation of livermorium around 2000 in a calcium-48 and curium-248 fusion reaction. The segment outlines how four livermorium isotopes have been produced, each with half-lives of tens of milliseconds, making direct observation challenging. The show also explains the naming of the neighboring elements 114 and 116, leading to Flerovium for 114 and Livermorium for 116 after discussions with Russian collaborators. Livermorium is named to honor the scientists at Livermore, the institution, and the city itself. The local community has warmly welcomed the name, with Livermorium Day and Livermorium Plaza established. A discussion on the predicted properties of Livermorium, its position in group 16, and the caution against smelling such a radioactive element rounds out the segment.

• First synthesis of livermorium in 2000 via Ca-48 + Cm-248 fusion
• Isotopes with tens of millisecond half-lives
• Naming of Flerovium (114) and Livermorium (116) through international discussions
• Livermorium named to honor LLNL scientists and the Livermore community
• Community reception: Livermorium Day and Livermorium Plaza reflect local support

Livermorium Overview

The video presents livermorium as a recently synthesized element in the periodic table, formed in the early 2000s through a fusion reaction between calcium-48 and curium-248. The team has since produced four different isotopes of livermorium, all with extremely short half-lives on the order of tens of milliseconds, which makes experimental observation challenging.

Synthesis and Isotopes

The fusion reaction involving heavy actinide targets yields livermorium, a heavy transactinide element in group 16. The isotopes discussed have minute half-lives, complicating direct experimental measurements and follow-up observations. The video notes the practical impossibility of presenting a physical bottle of the element due to its instability and radioactivity.

Naming the Elements 114 and 116

During preparations to name elements 114 and 116, the scientific community engaged in discussions with Russian colleagues and reached a consensus: element 114 is named Flerovium, and element 116 is Livermorium. The choice of Livermorium, rather than naming it after a single individual, honors the many scientists at Livermore National Laboratory, the institution, and the city of Livermore for their contributions to heavy element research.

Community Reception in Livermore

The speaker highlights a highly positive reception from the Livermore community. The local mayor, a water chemist, understands and appreciates chemistry and the significance of new elements on the periodic table. The community has further celebrated the naming with dedicated events such as Livermorium Day and the creation of Livermorium Plaza in downtown Livermore, underscoring scientific literacy and local pride linked to the laboratory’s presence.

Predicted Properties and Cautionary Notes

Because livermorium lies in group 16, there is a tendency to associate its hydrogen compounds with strong and distinctive odors seen in nearby chalcogen elements like hydrogen sulfide. The video discusses how such a smell is unverified for livermorium itself given its lack of hydrogen compounds and its extremely short lived isotopes. Additionally, any attempt to sense livermorium directly would be dangerous due to radioactivity.

Experimentation and Beam Dynamics

Towards the end, the discussion shifts to the experimental setup where ions are accelerated and observed as they pass through a target wheel and beamline, with the target wheel mounted on a fast-rotating axis. This imagery emphasizes the precision and scale involved in studying superheavy elements.

This video illustrates how outreach and public engagement can accompany complex, high-stakes scientific research, showing the connection between a national laboratory and the surrounding community.