curium

See also: Curium and -curium

English

WOTD – 11 February 2026
Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)
A sample of curium in a sealed container.
A 1903 photograph of the chemists and physicists Pierre and Marie Curie, whom the chemical element curium was named in honour of.

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/
  • Audio (Southern England):(file)
  • (General American) IPA(key): /ˈkjʊ.ɹi.əm/
  • Audio (General American):(file)
  • Rhymes: -ʊəɹiəm, -ɔːɹiəm
  • Hyphenation: cur‧i‧um

Noun

curium (uncountable)

  1. (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

References

  1. ^ curium, n.”, in OED Online , Oxford: Oxford University Press, July 2023; curium, n.”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
  2. ^ 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

Chemical element
Cm
Previous: amerisium (Am)
Next: berkelium (Bk)

Noun

curium (uncountable)

  1. curium

Czech

Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)

Pronunciation

  • IPA(key): [ˈkɪrɪjum]
  • Hyphenation: cu‧rium

Noun

curium n

  1. curium (transuranic chemical element with an atomic number of 96)

Declension

Danish

Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)

Etymology

From French Curie +‎ -ium. Named after Pierre and Marie Curie.

Noun

curium n (singular definite curiummet, not used in plural form)

  1. curium

Declension

Declension of curium
neuter
gender
singular
indefinite definite
nominative curium curiummet
genitive curiums curiummets

References

Dutch

Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)

Etymology

Borrowed from English curium.

Pronunciation

  • IPA(key): /ˈkyː.ri.ʏm/
  • Audio:(file)
  • Hyphenation: cu‧ri‧um

Noun

curium n (uncountable, no diminutive)

  1. curium

Finnish

Etymology

Internationalism (see English curium).

Pronunciation

  • IPA(key): /ˈkurium/, [ˈkurium]
  • Rhymes: -urium

Noun

curium

  1. 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.
Possessive forms of curium (Kotus type 5/risti, no gradation)
first-person singular possessor
singular plural
nominative curiumini curiumini
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)

  1. curium

Further reading

Latin

Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)

Pronunciation

Noun

curium n (genitive curiī); second declension

  1. curium

Declension

Second-declension noun (neuter).

Romanian

Noun

curium n (uncountable)

  1. alternative form of curiu

Declension

singular only indefinite definite
nominative-accusative curium curiumul
genitive-dative curium curiumului
vocative curiumule

Slovak

Chemical element
Cm
Previous: amerícium (Am)
Next: berkélium (Bk)

Pronunciation

  • IPA(key): /ˈkyrɪjʊm/

Noun

curium n

  1. 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

Chemical element
Cm
Previous: americium (Am)
Next: berkelium (Bk)

Noun

curium n

  1. curium

Declension

Declension of curium
nominative genitive
singular indefinite curium curiums
definite curiumet curiumets
plural indefinite
definite
Declension of curium
nominative genitive
singular indefinite curium curiums
definite curiet curiets
plural indefinite
definite
Declension of curium
nominative genitive
singular indefinite curium curiums
definite curium curiums
plural indefinite
definite

References