By I. Petryanov, D. Trifonov
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Additional resources for Elementary Order - Mendeleev's Periodic System
Sample text
Curie, discovered actinium, still another radioactive substance. It was not by chance that we used the word "substance". The discoveries of new elements enumerated above were unusual. When, for instance, Lecoq de Boisbaudran discovered gallium, he soon had radius, 36 at his disposal such amounts of its compounds that they could be weighed by rough scales. The discoveries of polonium, radium and actinium were made indirectly. As a result of prolonged chemical manipulations, the discoverer managed to concentrate a substance with high radioactivity.
It was found that the isotopes of argon, cobalt and tellurium with the highest atomic masses are also the most abundant. On the contrary, potassium, nickel and iodine are not notable for a high content of their heavier isotopes. But we already know that the atomic mass of an element is affected by the content of its isotopes in per cent. Hence, the first elements in the pairs Ar-K, Co-Ni and Te-I have the higher atomic masses. But the abundance of isotopes in nature is such that the atomic masses of the elements, with the exception of the three cases mentioned above, increases with the charge of the atomic nuclei.
But the abundance of isotopes in nature is such that the atomic masses of the elements, with the exception of the three cases mentioned above, increases with the charge of the atomic nuclei. Why this is so and not otherwise is an extremely complicated question. Some comprehension can be gained by resorting to the data of nuclear physics, as well as those of astrophysics that study the processes in which chemical elements originate as the result of nuclear reactions in the stars. we do not know the cause of periodicity".
Elementary Order - Mendeleev's Periodic System by I. Petryanov, D. Trifonov
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