01 / The discovery
A few atoms, made deliberately.
By the early 1940s, scientists had learned that nuclear reactions could create elements not found in meaningful amounts on Earth. The next step was to make heavier atoms one controlled collision at a time.
The reaction: plutonium-239 was bombarded with alpha particles—helium nuclei accelerated by the 60-inch cyclotron at Berkeley. The resulting atoms were identified as element 96, later known as curium.
The work was carried out by Glenn T. Seaborg, Ralph A. James, and Albert Ghiorso, with contributions from the wider wartime Berkeley team. Their first sample was extraordinarily small, but its radioactive decay provided a distinct signature.
Curium followed americium in the growing family of transuranium elements. The sequence gave researchers a clearer understanding of the actinides and supported the arrangement of the periodic table that is familiar today.
02 / A compact timeline
From target material to element symbol.
Element 96 is synthesized
At the University of California, Berkeley, researchers bombard plutonium-239 with alpha particles and produce curium-242.
The result enters the record
The discovery is documented while much nuclear research remains classified during the Second World War.
Discovery is announced
After declassification, the scientific community learns of element 96 and its first isotope.
The name is accepted
Curium becomes the official name, following the convention established by neighboring elements americium and europium.
Isotope chemistry expands
New isotopes, including curium-244, make it possible to study the element’s chemistry, decay, and potential scientific uses.
03 / The name
A tribute to the Curies.
Curium is named for Marie Skłodowska Curie and Pierre Curie, whose work transformed the study of radioactivity. The name also mirrors americium, named for the Americas and positioned above curium in the actinide sequence.
04 / What followed
A laboratory element with a long reach.
Curium remains intensely radioactive and rare, so its story is primarily a story of research. Its isotopes have helped scientists investigate the behavior of heavy nuclei and the chemistry of elements at the edge of the periodic table.
Dates and discovery details are presented as a concise educational reference. Curium is radioactive; handling and experiments belong only in authorized facilities with appropriate training.
Continue with the isotopes.
See how half-life gives curium’s story a measurable timescale.