/ak"teuh nuyd'/, n. Chem.
any element of the actinide series.
[1940-45; ACTIN- + -IDE, on the model of LANTHANIDE]

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Any of the series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103).

All are radioactive heavy metals; and only the first four (actinium, thorium, protactinium, and uranium) occur in nature in appreciable quantities. The other 11 (the transuranium elements) are unstable and are produced only artificially. Actinides are transition elements, so their atoms have similar configurations and similar physical and chemical behaviour; the most usual valences are 3 and 4.

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Universalium. 2010.

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  • actinide — ACTINÍDE s.f. Grup de 14 elemente din sistemul periodic al lui Mendeleev, situate după actiniu, având proprietăţi asemănătoare cu ale acestuia. – Din fr. actinides, germ. Aktiniden. Trimis de ana zecheru, 13.09.2007. Sursa: DEX 98  actiníde s. n …   Dicționar Român

  • actinide — [ aktinid ] n. m. • apr. 1950; gr. aktis, aktinos « rayon » et ide ♦ Phys. Élément radioactif dont le numéro atomique est compris entre 89 et 103. Les quatre premiers actinides, l actinium, le thorium, le protactinium, l uranium, existent à l… …   Encyclopédie Universelle

  • actinide — [ak′tə nīd΄] n. [< ACTIN(IUM) + IDE] any of the elements in the series (actinide series) of radioactive, metallic chemical elements from element 89 (actinium) through element 103 (lawrencium): actinides resemble lanthanides in electronic… …   English World dictionary

  • Actinide — The atomic bomb dropped on Nagasaki had a plutonium charge.[1] The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium thro …   Wikipedia

  • Actinide —     …   Deutsch Wikipedia

  • Actinide — La série chimique des actinides comprend les éléments chimiques du tableau périodique se situant entre l actinium et le lawrencium, possédant donc un numéro atomique entre 89 et 103 inclus. Les actinides sont tous des éléments radioactifs et… …   Wikipédia en Français

  • actiníde — s. n., pl. actiníde …   Romanian orthography

  • actinide — ac•ti•nide [[t]ˈæk təˌnaɪd[/t]] n. chem. any element of the actinide series • Etymology: 1945; actin ( ium) + ide, on the model of lanthanide …   From formal English to slang

  • actinide — aktinoidas statusas T sritis fizika atitikmenys: angl. actinoid vok. Actinoid, n rus. актиноид, m pranc. actinide, m …   Fizikos terminų žodynas

  • actinide — n. (also actinoid) Chem. any of the series of 15 radioactive elements having increasing atomic numbers from actinium to lawrencium. Phrases and idioms: actinide series this series of elements. Etymology: ACTINIUM + IDE as in lanthanide …   Useful english dictionary

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