- actinium isotope
- Макаров: изотоп актиния
Универсальный англо-русский словарь. Академик.ру. 2011.
actinium isotope
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Actinium — (pronEng|ækˈtɪniəm) is a radioactive chemical element with the symbol Ac and atomic number 89, which was discovered in 1899, the earliest discovered of the radioactive elements.CharacteristicsActinium is a silvery, radioactive, metallic element.… … Wikipedia
ACTINIUM — L’existence dans la pechblende de l’actinium, élément radioactif de numéro atomique 89, fut établie en 1899 par André Louis Debierne, collaborateur de Pierre et Marie Curie qui venaient, un an auparavant, de découvrir, dans ce minerai d’uranium,… … Encyclopédie Universelle
actinium — Symbol: Ac Atomic number: 89 Atomic weight: (227) Silvery radioactive metallic element, belongs to group 3 of the periodic table. The most stable isotope, Ac 227, has a half life of 217 years. Ac 228 (half life of 6.13 hours) also occurs in… … Elements of periodic system
Actinium — Eigenschaften … Deutsch Wikipedia
actinium series — noun : a radioactive series beginning with actinouranium, constituting the isotope of uranium of mass number 235, and ending with actinium D, constituting the nonradioactive isotope of lead of mass number 207: actinouranium, at. no. 92 (syn.… … Useful english dictionary
actinium — /ak tin ee euhm/, n. Chem. a radioactive silver white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. no.: 89; at. wt.: 227. [1900 05; ACTIN + IUM] * * * ▪ chemical… … Universalium
actinium-228 — /ækˌtɪniəm tu tu ˈeɪt/ (say ak.tineeuhm tooh tooh ayt) noun an isotope of actinium …
actinium — /ækˈtɪniəm/ (say ak tineeuhm) noun a radioactive chemical element, an isotope of mesothorium, occurring in pitchblende, and resembling the rare earths in chemical behaviour and valency. Symbol: Ac; relative atomic mass: 227 (most stable isotope); …
actinium series — Chem. the radioactive series that starts with uranium 235 and ends with a stable isotope of lead of mass number 207. [1955 60] * * * set of unstable heavy nuclei constituting one of the four radioactive series (q.v.). * * * … Universalium
Isotopes of actinium — Actinium (Ac) has no stable isotopes. A standard atomic mass cannot be given.An isotope of actinium occurring within the radioactive disintegration chain of thorium was known as: * mesothorium II : 228AcNaturally occurring actinium is composed of … Wikipedia
Isotopes de l'actinium — L actinium (Ac) comme tous les éléments de numéro atomique supérieur à celui du plomb, ne possède aucun isotope stable et aucune masse atomique standard ne peut donc lui être attribuée. Il possède 31 isotopes connus, de 206Ac à 236Ac, et six… … Wikipédia en Français
