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Definitions for protactinium: The Collaborative International Dictionary of English v.0.48
:
Protactinium \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]
WordNet (r) 2.0
:
protactinium
n : a short-lived radioactive metallic element formed from
uranium and disintegrating into actinium and then into
lead [syn: protoactinium, Pa, atomic number 91]
Elements database 20001107
:
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 applications are known.
Discovered in 1917 by Lise Meitner and Otto Hahn.
Related SitesProtactinium - Wikipedia, the free encyclopedia
Protactinium (pronounced /protæktnim/) is a chemical element with the ... Protactinium-231 (which is formed by the alpha decay of uranium-235 followed by ...
Protactinium
Basic information and history. ... The name protoactinium was shortened to protactinium in 1949. ... Protactinium has a bright metallic luster which it retains ...
It's Elemental - The Element Protactinium
The Element Protactinium - Basic Physical and Historical Information ... Protactinium's existence was confirmed in 1918 when another isotope, ...
[PDF] Protactinium
45k - Adobe PDF - View as html
naturally occurring isotopes, with protactinium-231 being the most abundant. ... Protactinium was first identified in 1913 by Kasimir Fajans and O.H. Gohring ...
Protactinium - Simple English Wikipedia, the free encyclopedia
Protactinium-231 (which is made by the alpha decay of Uranium-235 followed by ... Other authors conclude that no chain reactions are possible in Protactinium-231. ...
Protactinium
Protactinium-231, which is formed by the alpha decay of ... Protactinium occurs in pitchblende to the extent of about 1 part 231Pa to 10 million of ore. ...
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