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By Gerhart Friedlander, Joseph W. Kennedy
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Additional info for Introduction to radiochemistry
Among the natural radioactive bodies discussed in chapter I there are two, 2 and UZ, which have the same mass number UX same atomic number, but differ in their radioactive This is an example of nuclear isomerism. properties. Although UX2 and UZ had been known for several years the phenomenon as well as the of nuclear isomerism did not receive pair of isomers, much attention until another Br 80 was discovered among , artificially produced radioactive species in 1937. Some 70 pairs of nuclear isomers are now known.
Thus, to name only a few examples, the similarity between elements in the same column of the periodic table can now be ascribed to the similarity in their electron structures in the outermost shells; valence can be correlated with the number of electrons in the outer shell; the striking similarity between the fourteen rare ATOMIC NUCLEI 28 CH. II earths can be accounted for by the fact that they differ only in the number of electrons in the 4/ shell (which is well inside the atom) while the population of the 5s, 5p, 5d, and 6s shells is practically the Wave same for all of them.
Ores from a region known to be geologically very old (Huron Claim monazite and uraninite) have ages close to 2000 million years. X 9 years are of the same order as the "age of the universe" estimated from the red-shift phenomenon. ) be noted that studies of relative abundances of radioactive species yield some other information on ancient time scales. It has been carefully demonstrated that the ratio of AclJ to Ui is the same (1:139) for uranium samples from various sources; this is plausible if all our uranium had been formed at the same time; even if it had been formed in the same way at different times, the It may decay would leave in the younger samples more component.
Introduction to radiochemistry by Gerhart Friedlander, Joseph W. Kennedy