Moscovium: The Million Dollar Atom in Element 115

Overview

In this video, the host explains the naming of Moscovium, the first synthesized element 115, and the strong connection to the Russian city Dubna near Moscow. The discussion then moves to how superheavy elements are created and the delicate balance of energy and stability needed for fusion.

Key insights

• The isotope selection, especially calcium 48, is crucial for successful synthesis of Moscovium.
• Massive energy is needed to overcome proton-proton repulsion during fusion of calcium into americium targets.
• Only a few atoms of Moscovium are produced per experiment, costing millions of dollars per atom.
• Behind the target a narrow slit helps filter out junk fragments and isolate Moscovium in the detection signature.
• Moscovium sits in group 15 with phosphorus arsenic and bismuth, prompting questions about its chemistry and potential parallels to lighter elements.

Introduction to Moscovium

The video discusses the naming of element 115, Moscovium, and its connection to Moscow through the synthesis work carried out in Dubna, a renowned research hub for heavy element production. It highlights the tradition of naming new elements after places of significance in their discovery, noting parallels with other capital-city derived names in the periodic table.

How Superheavy Elements Are Made

The core topic is the synthesis of superheavy elements by colliding very light ions with very heavy targets. In Moscovium’s case, a calcium-48 beam is directed at an americium target. The two nuclei are both positively charged, so a large energy input is required to overcome electrostatic repulsion. However, too much energy makes the newly formed nucleus unstable and prone to fission. Therefore, researchers must select not only the right atomic numbers but also the right isotope to maximize survival probability. Calcium-48 is a rare and expensive isotope, comprising less than 0.1% of naturally occurring calcium, and production is limited to a few plants globally, with one plant in Russia emphasized in the talk.

Calcium-48 and the Cost of a New Atom

Calcium-48 atoms are ionized and separated magnetically in a mass spectrometer like setup, requiring enormous electrical power to yield only milligrams of material. In a cited Dubna experiment, calcium-48 cost about a million dollars. The fusion events that succeed are extremely rare, with only a tiny fraction resulting in the formation of Moscovium, and even then the nucleus quickly decays unless it lands in just the right energetic window.

Detection and Isolation

When a successful fusion occurs, Moscovium tends to exit the reaction line in a relatively straight trajectory. By placing a very narrow slit behind the target, researchers can filter out many of the byproducts and identify the Moscovium signal amid the background fragments.

Group 15 Chemistry and Speculation

Moscovium is in Group 15, which stretches from nitrogen to bismuth. The video discusses the chemistry of this group, noting arsenic’s toxicity versus bismuth’s relatively low toxicity and metallic character. There is speculation about whether Moscovium will behave more like phosphorus and arsenic or resemble metallic bismuth in its chemistry, with the caveat that current technology makes detailed chemical studies of Moscovium impractical.

Names, Collaboration, and Costs

The host reflects on Moscovium as one of the few elements named after a capital city, with some light humor about the Scottish connection via the mc prefix in surnames. The element’s creation is framed as a fantastic example of international collaboration, since americium samples used in the Moscovium experiments were produced in the United States, underscoring the global nature of heavy element research. The talk quotes the atom count seen in experiments, with the Dubna lab reporting as many as 27 atoms of a Moscovium isotope in a single experiment, illustrating the minuscule scale of these measurements compared to everyday numbers of atoms in a teacup (around 10^26-10^27). Each Moscovium atom costs millions, earning it the moniker of the million-dollar atom.

Conclusion

The video ends by highlighting Moscovium as a symbol of cutting-edge science and international teamwork, a recognition that extends beyond chemistry into the realm of large-scale scientific collaboration and advanced instrumentation.