protactinium

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pro·tac·tin·i·um

 (prō′tăk-tĭn′ē-əm)
n. Symbol Pa
A rare, extremely toxic, radioactive, lustrous, metallic element having more than 30 known isotopes and isomers, the most common of which is Pa-231 with a half-life of 32,760 years. Atomic number 91; atomic weight 231.036; melting point 1,572°C; specific gravity 15.37 (calculated); valence 2, 3, 4, 5. See Periodic Table.

[prot(o)- + actinium (so called because it decays into actinium).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

protactinium

(ˌprəʊtækˈtɪnɪəm)
n
(Elements & Compounds) a toxic radioactive metallic element that occurs in uranium ores and is produced by neutron irradiation of thorium. Symbol: Pa; atomic no: 91; half-life of the most stable isotope, 231Pa: 32 500 years; valency: 4 or 5; relative density: 15.37 (calc.); melting pt: 1572°C. Former name: protoactinium
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

prot•ac•tin•i•um

(ˌproʊ tækˈtɪn i əm)

n.
a radioactive, metallic chemical element. Symbol: Pa; at. no.: 91.
[1915–20]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

pro·tac·tin·i·um

(prō′tăk-tĭn′ē-əm)
Symbol Pa A rare, extremely toxic, radioactive metallic element of the actinide series that occurs in uranium ores. Its most common isotope has a half-life of 32,500 years. Atomic number 91. See Periodic Table.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.protactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into leadprotactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
протактиний
protaktinium
protactinium
protaktiinium
protaktinium
protactinium
protaktinij
protactinium
protactinium
protaktinium
protaktinij
protaktinium

protactinium

n (Chem) → Protaktinium nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
See Anthony Fitzherbert, New Natura Brevium (London: Rawlins, Roycroft and Flesher, 1686), pp.
from Anthony Fitzherbert's sixteenth-century work, Natura Brevium.
Paulo, en su libro VI Brevium, sostiene que si servus non voluntate domini navem exercuerit, si sciente eo, quasi tributoria, si ignorante, de peculio actio dabitur (50).