Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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. cross-reference: Periodic Table.
from the GNU version of the Collaborative International Dictionary of English.
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A chemical element (symbol Pa) with
atomic number 91.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Her expertise was on separating protactinium from carnotite and she had previously worked as a consultant for physicians and hospitals. 141
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An element discovered in 1982 has been named meitnerium to honor Lise Meitner (1878-1968), the Austrian-Swedish physicist and mathematician who discovered the element protactinium and made major contributions to the understanding of nuclear fission.
Elements 2009
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Kudos to moose drool whose handle happens to rhyme with April Fools, too! for the initial protactinium outline.
New Levels of LEED 2008
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LEMON cerium germanium gold hafnium iodine iron lanthanum neodymium phosphorus praseodymium protactinium samarium scandium silver sulphur thorium titanium uranium vanadium yttrium zirconium
Zolar’s Magick Of Color Simon 1994
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LEMON cerium germanium gold hafnium iodine iron lanthanum neodymium phosphorus praseodymium protactinium samarium scandium silver sulphur thorium titanium uranium vanadium yttrium zirconium
Zolar’s Magick Of Color Simon 1994
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LEMON cerium germanium gold hafnium iodine iron lanthanum neodymium phosphorus praseodymium protactinium samarium scandium silver sulphur thorium titanium uranium vanadium yttrium zirconium
Zolar’s Magick Of Color Simon 1994
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LEMON cerium germanium gold hafnium iodine iron lanthanum neodymium phosphorus praseodymium protactinium samarium scandium silver sulphur thorium titanium uranium vanadium yttrium zirconium
Zolar’s Magick Of Color Simon 1994
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Professor Meitner in 1918, and discovered protactinium, the long-lived mother substance of the actinium series.
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However, as U238 decays into its daughter products thorium and protactinium, both beta and gamma radiation are released, increasing the radiation burden further.
Infowars 2010
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And gold and protactinium and indium and gallium, (gasp)
Qulog 2.0 2010
oroboros commented on the word protactinium
Pa.
December 16, 2007