Meitnerium

Meitnerium was first created in 1982 at the GSI laboratory in Darmstadt by the team of Peter Armbruster and Gottfried Munzenberg, by fusing bismuth and iron nuclei. It was named after the physicist Lise Meitner, who with Otto Frisch first explained nuclear fission. Meitnerium is an intensely radioactive synthetic metal, known only from a very small number of atoms. Its isotopes survive at most a few seconds, and no chemistry of it has yet been done; each atom is identified only indirectly, by the cascade of alpha decays that follows its creation, and it takes weeks of accelerator time to make even a handful.

The original 1982 experiment that identified meitnerium detected the element from a single atom, one of the most extreme examples in the whole history of chemistry of a substance being characterised from so minimal a sample, and it took years of further, painstaking accelerator runs at GSI to confirm the finding beyond doubt before the element could be formally accepted and named. Producing even that one atom required bombarding a bismuth target with a beam of iron ions for an extended period, a probability so low that success depended as much on patience as on technique. Meitnerium's longest-lived known isotope still survives only a few seconds, leaving essentially nothing of its chemistry studied directly.

Meitnerium honours Lise Meitner, the Austrian-Swedish physicist who, having fled Nazi Germany, worked out with her nephew Otto Frisch the correct interpretation of the experiments of her former colleague Otto Hahn, recognising that the uranium nucleus had split, and coining the term fission. Hahn alone received the Nobel Prize for the discovery, in one of the most criticised omissions in the history of the award, and the naming of element 109 for Meitner is often seen as a measure of restitution. She is one of very few women, alongside Marie Curie, to have an element named for her. Meitnerium has no ancient or esoteric tradition, being a synthetic element of the 1980s; its name carries a note of historical justice, honouring a physicist long denied her due for one of the pivotal discoveries of the age.

Later historical research into the Nobel committee's own archives, opened to scholars decades after the fact under Sweden's disclosure rules, confirmed that Meitner had been seriously considered and repeatedly nominated for the prize in multiple years, strengthening the now-widespread scholarly judgement that her exclusion reflected the limited recognition available to women physicists of her era rather than any real doubt about her scientific contribution.