Which superheavy element is named after the Russian town of Dubna?

Dubnium, element 105, named for the Joint Institute for Nuclear Research - and the name is the settlement of a fight that ran for about thirty years.

Soviet and American teams both claimed the discovery in the late 1960s, along with element 104, and both proposed names: the Soviets wanted nielsbohrium and kurchatovium, the Americans hahnium and rutherfordium. Each side's textbooks used its own names, so the periodic table genuinely disagreed with itself depending on which country printed it - the Transfermium Wars, resolved only in 1997 by a compromise that gave the Americans 106 and the Russians 105.

These elements exist for fractions of a second and are made a handful of atoms at a time, by firing one nucleus at another and detecting the decay chain of a single event. Dubna has since produced several more, including oganesson, named for Yuri Oganessian - only the second element named for a living person. The current edge of the table is element 118, and whether an island of relatively stable superheavy nuclei exists a little beyond it is still open.