a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Syn: ↑protactinium, ↑Pa, ↑atomic number 91
Hypernyms: ↑metallic element, ↑metal

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variant of protactinium

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/proh'toh ak tin"ee euhm/, n. Chem.

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protoactinium /prō-tō-ak-tinˈi-əm/ (chem)
noun a former variant of ↑protactinium

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Useful english dictionary. 2012.

Look at other dictionaries:

  • protoactinium — [prōt΄ō ak tin′ē əm] n. former name for PROTACTINIUM …   English World dictionary

  • protoactinium — SYN: protactinium. * * * protoactinium var of PROTACTINIUM …   Medical dictionary

  • protoactinium — /proh toh ak tin ee euhm/, n. Chem. protactinium. * * * …   Universalium

  • protoactinium — n. radioactive metallic element …   English contemporary dictionary

  • protoactinium — /ˌproʊtoʊækˈtɪniəm/ (say .prohtohak tineeuhm) noun Obsolete → protactinium …   Australian English dictionary

  • Protactinium — Eigenschaften …   Deutsch Wikipedia

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

  • Decay chain — In nuclear science, the decay chain refers to the radioactive decay of different discrete radioactive decay products as a chained series of transformations. Most radioactive elements do not decay directly to a stable state, but rather undergo a… …   Wikipedia

  • Isotopes of protactinium — Protactinium (Pa) Standard atomic mass: 231.03588(2) u The element has no stable isotopes. However, it has a characteristic terrestrial isotopic composition and thus an atomic mass can be given.Isotopes of protactinium occurring within the… …   Wikipedia

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