English
WOTD – 11 February 2026
Etymology
From Curie + -ium (suffix forming names of metallic elements),[1] coined by the American scientists Glenn T. Seaborg (1912–1999), Ralph A. James (1920–1973), and Albert Ghiorso (1915–2010), who synthesized the element in 1944 and named it in honour of Pierre Curie (1859–1906) and Marie Skłodowska Curie (1867–1934) who, with Henri Becquerel, were awarded the 1903 Nobel Prize in Physics for discoveries in radioactivity.[2]
Pronunciation
- enPR: kūr'ēəm, IPA(key): /ˈkjʊə.ɹi.əm/, /ˈkjɔː.ɹi.əm/
- (General American) IPA(key): /ˈkjʊ.ɹi.əm/
- Rhymes: -ʊəɹiəm, -ɔːɹiəm
- Hyphenation: cur‧i‧um
Noun
curium (uncountable)
- (chemistry) A radioactive and highly fissile, silver-grey, metallic, transuranic chemical element (symbol Cm) with an atomic number of 96, which is artificially produced in a particle accelerator.
1946 November 18 (date delivered), Glenn T[heodore] Seaborg, Plutonium and Other Transuranium Elements (MUC-1780; MDDC (Manhattan District Declassification); no. 505), Oak Ridge, Tenn.: United States Atomic Energy Commission, →OCLC, page 8:Curium was the third transuranium element to be discovered. The first isotope of this element was the isotope, Cm242, which was identified by G. T. Seaborg, R. A. James and A. Ghiorso at the Metallurgical Laboratory as the result of its production in the Berkeley cyclotron […] The availability of this isotope of curium made it possible to study the chemical properties of this element by the use of the tracer technique. Extensive investigations have led to the conclusion that curium probably exists exclusively in the III oxidation state in aqueous solution.
1948 January 21, S[tanley] G[erald] Thompson, R[alph] A[rthur] James, L. O. Morgan, The Tracer Chemistry of Americium and Curium (AECD-1907), Oak Ridge, Tenn.: Technical Information Division, Oak Ridge Directed Operations, United States Atomic Energy Commission, →OCLC, page 1:The chemical properties of americium and curium may be summarized in the statement that they bear a striking resemblance to the rare earth elements, particularly those of atomic numbers 60 to 64. […] Thus the chemical properties of americium and curium support the view that these elements are members of an actinide series in which the 5f electron shell is being filled just as the 4f shell is being filled in the rare earth series. Curium is believed to possess seven 5f electrons just as gadolinium possesses seven 4f electrons.
1994, Glenn T[heodore] Seaborg, “Alchemy on an Industrial Scale: Plutonium from Hanford and a Pair of New Elements: January 1, 1945 – July 16, 1945”, in Ronald L. Kathren, Jerry B. Gough, Gary T. Benefiel, editors, The Plutonium Story: The Journals of Professor Glenn T. Seaborg 1939–1946, Columbus, Oh.: Battelle Press, →ISBN, footnote 10, page 626:The modern figure for the half-life of curium-242 is 163 days—more than five months.
Derived terms
- Cm (symbol)
- curium bromide
- curium chloride
- curium dioxide
- curium iodide
- curium oxide
- curium tetrafluoride
- curium trioxide
Translations
chemical element with an atomic number of 96
References
- ^ “curium, n.”, in OED Online , Oxford: Oxford University Press, July 2023; “curium, n.”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
- ^ Glenn T[heodore] Seaborg, Ralph A[rthur] James, Albert Ghiorso ([1949]), “The New Element Curium (Atomic Number 96)”, in National Nuclear Energy Series (PPR (Plutonium Project Record); 14B; The Transuranium Elements: Research Papers; paper no. 22.2)[1], Washington, D.C.: Office of Scientific and Technical Information, United States Department of Energy, →OCLC, archived from the original on 21 September 2008, pages 12–13:
As the name for the element of atomic number 96 we should like to propose "curium", with symbol Cm. The evidence indicates that element 96 contains seven 5f electrons and is thus analogous to the element gadolinium, with its seven 4f electrons in the regular rare earth series. On this basis element 96 is named after the Curies in a manner analogous to the naming of gadolinium, in which the chemist [Johan] Gadolin was honored.
Further reading
Afrikaans
Noun
curium (uncountable)
- curium
Czech
Pronunciation
- IPA(key): [ˈkɪrɪjum]
- Hyphenation: cu‧rium
Noun
curium n
- curium (transuranic chemical element with an atomic number of 96)
Declension
Declension of curium (semisoft neuter foreign)
Danish
Etymology
From French Curie + -ium. Named after Pierre and Marie Curie.
Noun
curium n (singular definite curiummet, not used in plural form)
- curium
Declension
References
Dutch
Etymology
Borrowed from English curium.
Pronunciation
- IPA(key): /ˈkyː.ri.ʏm/
- Hyphenation: cu‧ri‧um
Noun
curium n (uncountable, no diminutive)
- curium
Finnish
Etymology
Internationalism (see English curium).
Pronunciation
- IPA(key): /ˈkurium/, [ˈkurium]
- Rhymes: -urium
Noun
curium
- curium
Declension
| Inflection of curium (Kotus type 5/risti, no gradation)
|
| nominative
|
curium
|
curiumit
|
| genitive
|
curiumin
|
curiumien
|
| partitive
|
curiumia
|
curiumeja
|
| illative
|
curiumiin
|
curiumeihin
|
|
|
singular
|
plural
|
| nominative
|
curium
|
curiumit
|
| accusative
|
nom.
|
curium
|
curiumit
|
| gen.
|
curiumin
|
| genitive
|
curiumin
|
curiumien
|
| partitive
|
curiumia
|
curiumeja
|
| inessive
|
curiumissa
|
curiumeissa
|
| elative
|
curiumista
|
curiumeista
|
| illative
|
curiumiin
|
curiumeihin
|
| adessive
|
curiumilla
|
curiumeilla
|
| ablative
|
curiumilta
|
curiumeilta
|
| allative
|
curiumille
|
curiumeille
|
| essive
|
curiumina
|
curiumeina
|
| translative
|
curiumiksi
|
curiumeiksi
|
| abessive
|
curiumitta
|
curiumeitta
|
| instructive
|
—
|
curiumein
|
| comitative
|
See the possessive forms below.
|
| first-person singular possessor
|
|
|
singular
|
plural
|
| nominative
|
curiumini
|
curiumini
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| accusative
|
nom.
|
curiumini
|
curiumini
|
| gen.
|
curiumini
|
| genitive
|
curiumini
|
curiumieni
|
| partitive
|
curiumiani
|
curiumejani
|
| inessive
|
curiumissani
|
curiumeissani
|
| elative
|
curiumistani
|
curiumeistani
|
| illative
|
curiumiini
|
curiumeihini
|
| adessive
|
curiumillani
|
curiumeillani
|
| ablative
|
curiumiltani
|
curiumeiltani
|
| allative
|
curiumilleni
|
curiumeilleni
|
| essive
|
curiuminani
|
curiumeinani
|
| translative
|
curiumikseni
|
curiumeikseni
|
| abessive
|
curiumittani
|
curiumeittani
|
| instructive
|
—
|
—
|
| comitative
|
— |
curiumeineni
|
| second-person singular possessor
|
|
|
singular
|
plural
|
| nominative
|
curiumisi
|
curiumisi
|
| accusative
|
nom.
|
curiumisi
|
curiumisi
|
| gen.
|
curiumisi
|
| genitive
|
curiumisi
|
curiumiesi
|
| partitive
|
curiumiasi
|
curiumejasi
|
| inessive
|
curiumissasi
|
curiumeissasi
|
| elative
|
curiumistasi
|
curiumeistasi
|
| illative
|
curiumiisi
|
curiumeihisi
|
| adessive
|
curiumillasi
|
curiumeillasi
|
| ablative
|
curiumiltasi
|
curiumeiltasi
|
| allative
|
curiumillesi
|
curiumeillesi
|
| essive
|
curiuminasi
|
curiumeinasi
|
| translative
|
curiumiksesi
|
curiumeiksesi
|
| abessive
|
curiumittasi
|
curiumeittasi
|
| instructive
|
—
|
—
|
| comitative
|
— |
curiumeinesi
|
| first-person plural possessor
|
|
|
singular
|
plural
|
| nominative
|
curiumimme
|
curiumimme
|
| accusative
|
nom.
|
curiumimme
|
curiumimme
|
| gen.
|
curiumimme
|
| genitive
|
curiumimme
|
curiumiemme
|
| partitive
|
curiumiamme
|
curiumejamme
|
| inessive
|
curiumissamme
|
curiumeissamme
|
| elative
|
curiumistamme
|
curiumeistamme
|
| illative
|
curiumiimme
|
curiumeihimme
|
| adessive
|
curiumillamme
|
curiumeillamme
|
| ablative
|
curiumiltamme
|
curiumeiltamme
|
| allative
|
curiumillemme
|
curiumeillemme
|
| essive
|
curiuminamme
|
curiumeinamme
|
| translative
|
curiumiksemme
|
curiumeiksemme
|
| abessive
|
curiumittamme
|
curiumeittamme
|
| instructive
|
—
|
—
|
| comitative
|
— |
curiumeinemme
|
| second-person plural possessor
|
|
|
singular
|
plural
|
| nominative
|
curiuminne
|
curiuminne
|
| accusative
|
nom.
|
curiuminne
|
curiuminne
|
| gen.
|
curiuminne
|
| genitive
|
curiuminne
|
curiumienne
|
| partitive
|
curiumianne
|
curiumejanne
|
| inessive
|
curiumissanne
|
curiumeissanne
|
| elative
|
curiumistanne
|
curiumeistanne
|
| illative
|
curiumiinne
|
curiumeihinne
|
| adessive
|
curiumillanne
|
curiumeillanne
|
| ablative
|
curiumiltanne
|
curiumeiltanne
|
| allative
|
curiumillenne
|
curiumeillenne
|
| essive
|
curiuminanne
|
curiumeinanne
|
| translative
|
curiumiksenne
|
curiumeiksenne
|
| abessive
|
curiumittanne
|
curiumeittanne
|
| instructive
|
—
|
—
|
| comitative
|
— |
curiumeinenne
|
| third-person possessor
|
|
|
singular
|
plural
|
| nominative
|
curiuminsa
|
curiuminsa
|
| accusative
|
nom.
|
curiuminsa
|
curiuminsa
|
| gen.
|
curiuminsa
|
| genitive
|
curiuminsa
|
curiumiensa
|
| partitive
|
curiumiaan curiumiansa
|
curiumejaan curiumejansa
|
| inessive
|
curiumissaan curiumissansa
|
curiumeissaan curiumeissansa
|
| elative
|
curiumistaan curiumistansa
|
curiumeistaan curiumeistansa
|
| illative
|
curiumiinsa
|
curiumeihinsa
|
| adessive
|
curiumillaan curiumillansa
|
curiumeillaan curiumeillansa
|
| ablative
|
curiumiltaan curiumiltansa
|
curiumeiltaan curiumeiltansa
|
| allative
|
curiumilleen curiumillensa
|
curiumeilleen curiumeillensa
|
| essive
|
curiuminaan curiuminansa
|
curiumeinaan curiumeinansa
|
| translative
|
curiumikseen curiumiksensa
|
curiumeikseen curiumeiksensa
|
| abessive
|
curiumittaan curiumittansa
|
curiumeittaan curiumeittansa
|
| instructive
|
—
|
—
|
| comitative
|
— |
curiumeineen curiumeinensa
|
|
French
Pronunciation
Noun
curium m (uncountable)
- curium
Further reading
Latin
Pronunciation
Noun
curium n (genitive curiī); second declension
- curium
Declension
Second-declension noun (neuter).
Romanian
Noun
curium n (uncountable)
- alternative form of curiu
Declension
Slovak
Pronunciation
Noun
curium n
- curium (element)
Further reading
- “curium”, in Slovníkový portál Jazykovedného ústavu Ľ. Štúra SAV [Dictionary portal of the Ľ. Štúr Institute of Linguistics, Slovak Academy of Science] (in Slovak), https://slovnik.juls.savba.sk, 2003–2026
Swedish
Noun
curium n
- curium
Declension
References