What does curium mean?
Curium is a dense, silvery synthetic metal and one of the transuranic elements, bearing atomic number 96 and the symbol Cm. It sits in the actinide series of the periodic table alongside elements such as americium and berkelium. First produced in 1944 at the University of Chicago during wartime nuclear research, it was named in honor of Marie and Pierre Curie, the pioneering investigators of radioactivity. Because all of its isotopes are radioactive and none occur naturally in appreciable quantities, curium exists only in laboratory-made or trace amounts, typically produced by bombarding plutonium or americium targets with neutrons or charged particles. Its most useful isotope, curium-244, releases substantial heat through radioactive decay, which makes it valuable as a power source for spacecraft instruments such as those on Mars rovers. The word belongs firmly to the vocabulary of nuclear chemistry and physics rather than everyday speech.
nounA synthetic radioactive metallic chemical element with atomic number 96 and symbol Cm, belonging to the actinide series.
- The synthetic radioactive metallic element with atomic number 96 and symbol Cm, used mainly in scientific research and as a heat and power source in some spacecraft instruments.
"The spacecraft's radioisotope heater units contained pellets of curium-244."
"Scientists produced the first curium in 1944 by bombarding plutonium with alpha particles."
"Because curium isotopes emit significant heat, they have been used to power instruments aboard lunar rovers."
As with other element names used as substances, curium takes no plural; quantities are expressed as 'amounts of curium' or by isotope (e.g., 'grams of curium-244').
"The sample contained micrograms of curium."
Curium glows faintly purple in the dark thanks to its intense radioactivity — and it's named after the woman who pioneered radioactivity research itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of curium
Curium was named in honor of Marie and Pierre Curie, whose early twentieth-century research laid the foundations of radiochemistry. The element was first identified in 1944 by Glenn Seaborg and his collaborators, who coined the name by combining the Curies' surname with the '-ium' ending conventional for metallic elements, following the model set by its periodic-table neighbor americium. Its symbol, Cm, derives directly from that name.
How curium is actually used
Strictly a technical/scientific term, encountered almost exclusively in chemistry, physics, and nuclear science writing. It has no figurative or everyday usage.
Easily confused with curium
The curie (Ci) is a unit of radioactivity named for the same scientists, whereas curium is the chemical element itself.