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The longest-lived and most abundant (nearly 100%) naturally occurring isotope of protactinium, protactinium-231, has a half-life of 32,760 years and is a decay product of uranium-235. Much smaller trace amounts of the short-lived protactinium-234 and its nuclear isomer protactinium-234m occur in the decay chain of uranium-238 .
The former occurs as an intermediate decay product of 235 U, while the latter two occur as intermediate decay products of 238 U. 231 Pa makes up nearly all natural protactinium. The primary decay mode for isotopes of Pa lighter than (and including) the most stable isotope 231 Pa is alpha decay , except for 228 Pa to 230 Pa, which primarily ...
This research resulted in the successful identification of a new element in the decay chain between uranium-235 and actinium, later named protactinium. The discovery of protactinium completed the early version of the periodic table proposed by Dmitri Mendeleev, who predicted the existence of an element between thorium and uranium in 1871. [5]
PaOS is a light-yellow non-volatile solid with a cubic crystal lattice isostructural to that of other actinide oxysulfides. It is obtained by reacting protactinium(V) chloride with a mixture of hydrogen sulfide and carbon disulfide at 900 °C. [2] In hydrides and nitrides, protactinium has a low oxidation state of about +3.
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
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Several key mistakes could throw off the accuracy of blood pressure readings for people who take them at home. The average "normal" blood pressure is 120/80, according to the American Heart ...
protactinium-240: 2 120 plutonium-229: 2.0 120 actinium-230: 2.03 122 oxygen-15: 2.0373 122.24 bismuth-194m1: 2.08 125 actinium-223: 2.10 126 bismuth-211: 2.14 128 bismuth-216: 2.17 130 lead-191m: 2.18 131 polonium-221: 2.2 130 neptunium-242: 2.2 130 protactinium-238: 2.27 136 neptunium-244: 2.29 137 mendelevium-252: 2.30 138 astatine-221: 2.3 ...