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1
The Radiochemistry of
Protactinium
Sodium hydroxide precipitates protactinium from a citrate, but not from a tartrate
solution. With H2O2 in large excess, protactinium(V) forms a precipitate which is
insoluble in NH^OH and NaOH. The precipitate is soluble in dilute H,,SO^ only ...
2
The History and Use of Our Earth's Chemical Elements: A ...
PROTACTINIUM SYMBOL: Pa PERIOD: 7 SERIES NAME: Actinum ATOMIC NO:
91 ATOMIC MASS: 231 .0358 amu VALENCE: 4 and 5 OXIDATION STATE: +4
and +5 NATURAL STATE: Solid ORIGIN OF NAME: A combination of the Greek ...
3
Standard Potentials in Aqueous Solution
protactinium is rapidly oxidized by air. In very acidic media ([H+] > 2 M) the
predominant tetravalent species is the ion Pa**"I", which appears to be less
easily hydrolyzable than pentavalent protactinium. In the +5 oxidation state the
protactinium ...
Allen J. Bard, Roger Parsons, Joseph Jordan,
1985
4
Handbook of Elemental Speciation, Handbook of Elemental ...
5.3 Protactinium K. Fajans and O.H. Gohring describe the discovery of
protactinium (Pa-234) in 1913. They gave the new element the name brevium. In
1918, O. Hahn and L. Meitner have isolated the longer living isotope Pa-231. Pa-
231 has ...
5
Dictionary of Organometallic Compounds
Protactinium (Fr.), Protaktinium (Ger.), Protactinio (Sp.), Protattinio (Ital.),
IlpOTaKTHHHH (Protactinii) (Russ.), (Japan.) on the solubility of the compound
inhaled. The skeleton is the main site for the deposition of protactinium, with
smaller ...
6
Dictionary of Inorganic Compounds, Supplement 4
V) chloride oxide (PaCl,O), IC-401024 CI403Pa2 Protactinium! K) chloride oxide (
Pa2Cl4O3), IC-401031 Cl8OPa2 Protactinium! K) chloride oxide (Pa,ClgO), IC-
401 040 F07Pa, Protactinium! (0 fluoride oxide (Pa3FO7), IC-401058 F8OPa2 ...
7
A Guide to the Elements
PROTACTINIUM Atomic Number 91 Chemical Symbol Pa Group l|lB—Transition
Element (The Actinidesl 'IIIIA IIIA IVA YA VIA \i1lA||-|g \i'll!B a Nulflig _IlI_l!_;l\lll
va_via' vuaflk. 51:, IBJIII-ll; l(lCci 5i:l'l'i v CrlMnlFe ColNilCulZnlGc|Ge Aslie lib Sr
Y ...
8
Radionuclides in the Environment
Only the most common techniques are described here. 4.1 Precipitation There
are various chemicals that can be used to precipitate and isolate protactinium
from a sample solution. This step is vital as it can eliminate other elements (Ta, Zr
, Nb ...
9
The Chemistry of the Actinide and Transactinide Elements ...
The precipitation of protactinium as phenylarsonate from acid solutions can be
carried out in the presence of Ni, Co, Cr, La, Fe(III), Mn, Cu, Ti, Th, U, and other
elements. Zr, Nb, Ta, fluoro‐, and phosphate ions prevent the determination ...
Lester R. Morss, Norman M. Edelstein, J. Fuger,
2010
10
Chemistry and Analysis of Radionuclides: Laboratory ...
Protactinium is the third actinide and the first in the group to have electrons in the
5f shell. The electron configuration of its ground state 2 1 2 is [Rn]5f 6d 7s , and
its major oxidation state is +V. Although the oxidation state +IV is also possible, ...
Jukka Lehto, Xiaolin Hou,
2011
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Post Hunt 2015: The clues
130: Dysprosium + Protactinium - Argon. 145: The third is first. The 23rd is the only one that doesn't count. 201: You can beat the rap, but you can't beat the ride. «Washington Post, 五月 15»
Thorium Can Serve As A Nuclear Fuel For Commercial Electricity …
What is left is known as protactinium or 233Pa. Image: dymidziuk.janusz, CC BY-NC-SA After around a month or more, the 233Pa which itself is radioactive will ... «Science 2.0, 四月 15»
My Great-Great-Aunt Discovered Francium. And It Killed Her.
If thorium then turns a neutron into a proton and sheds an electron, called beta-minus decay, it becomes protactinium, element 91. This series of transformations ... «New York Times, 十二月 14»
Book Review: The Lost Elements
... others, such as “brevium,” were isotopes, or variations, on other elements (in this case, protactinium). Many of these efforts, the authors show, were not wasted ... «Scientific American, 十一月 14»
The element that causes arguments
So uranium becomes thorium, which in turn becomes protactinium, until finally it decays into lead. These decay elements produce other forms of radiation - beta ... «BBC News, 十月 14»
Separation of Rare Earths – Art vs. Science (Part III)
The daughters may be radium, radon, protactinium, and, actinium as the major ones to be concerned about. There are others but they have short half-lives, that ... «InvestorIntel, 五月 14»
DOE's Recycling Nickel Scrap Document Confirms Presence of …
Contaminants in DOE nickel scrap include these radioactive elements, Thorium 234, Protactinium 234Pa, Caesium 137, Plutonium 239 (trace), Cobalt 90 ... «HNN Huntingtonnews.net, 一月 14»
Facts About Neptunium
Because 237Np (half-life 2.14 million years) decays to a strongly radioactive and short-lived protactinium daughter (half-life 26.9 days), its study can help ... «LiveScience.com, 九月 13»
Facts About Protactinium
Word Origin: The word protactinium comes from the Greek protos, meaning first, and actinium. In effect, it means “parent of actinium” because actinium is a decay ... «LiveScience.com, 九月 13»
Naming radon — and the lessons of protactinium
Late in 2012, we were preparing what became the Nature Chemistry Thesis article The Ends of Elements, looking at both the history and the future of the suffixes ... «Nature.com, 八月 13»