The element named in honor of Marie and Pierre Curie is curium.
Curium is the synthetic chemical element with atomic number 96 and the symbol Cm. Scientists created it in 1944 by bombarding plutonium with alpha particles. The discovery was made by a team led by Glenn T. Seaborg at the University of California, Berkeley, during World War II-era nuclear research.
The name recognizes both Marie and Pierre Curie, whose pioneering investigations established the science of radioactivity and led to the discoveries of polonium and radium. Curium is therefore distinct from radium, which the Curies discovered, and from polonium, which Marie named after Poland.
Curium is a highly radioactive actinide and does not occur naturally in meaningful quantities. Its most common isotope, curium-244, has been used in scientific instruments and as a source of alpha particles. A common mix-up is assuming that every element associated with Marie Curie was discovered by her; curium was named for the Curies decades after their work.