Pa (protactinium)

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• PROTACTINIUM — Le protactinium (Pa) est l’élément chimique de numéro atomique 91. Tous ses isotopes sont radioactifs; deux d’entre eux existent dans la nature associés à la géochimie de l’uranium. L’isotope de masse 231, émetteur 見 de période 1/2 = 34 000 ans,… …   Encyclopédie Universelle

• Protactinium — Thorium ← Protactinium → Uranium Pr …   Wikipédia en Français

• Protactinium — The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest lived isotope, 231 (T1/2 = 32,500 yrs.) Also called brevium, Uranium X2 and UX2. [PJC] …   The Collaborative International Dictionary of English

• Protactinium-230 — is a radioactive isotope of protactinium. It has 91 electrons and protons and 139 neutrons. It has a half life of 17.4 days. After a beta minus decay it turns into Uranium 230. It is not found in nature because it is highly unstable and has a… …   Wikipedia

• protactinium — Symbol: Pa Atomic number: 91 Atomic weight: (231) Radioactive metallic element, belongs to the actinoids. The most stable isotope, Pa 231 has a half life of 2.43*10^4 years. At least 10 other radioactive isotopes are known. No practical… …   Elements of periodic system

• protactinium — [prō΄tak tin′ē əm] n. [ModL: see PROTO & ACTINIUM] a rare, radioactive, metallic chemical element, one of the actinides, found in pitchblende: symbol, Pa; at. no., 91: see the periodic table of elements in the Reference Supplement …   English World dictionary

• Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ …   Wikipedia

• Protactinium — Eigenschaften …   Deutsch Wikipedia

• Protactinium(V) chloride — chembox new ImageFile = ImageSize = IUPACName = Protactinium(V) chloride OtherNames = Protactinium pentachloride, Protactinium chloride Section1 = Chembox Identifiers Abbreviations = CASNo = 13760 41 3 EINECS = PubChem = SMILES = InChI = RTECS =… …   Wikipedia

• Protactinium(V)-chlorid — Kristallstruktur Keine Kristallstruktur vorhanden Kristallsystem monoklin[1] Raumgruppe C2/c …   Deutsch Wikipedia

• protactinium — /proh tak tin ee euhm/, n. Chem. a radioactive, metallic element. Symbol: Pa; at. no.: 91. Also, protoactinium. [1915 20; PROT + ACTINIUM] * * * ▪ chemical element  (Pa),    radioactive chemical element of the actinoid series of the periodic… …   Universalium