What is DISPLACEMENT LAW?

F Soddy and KFajans formulation that radiation of an alpha particle reduces the atomic number by two and the mass number by 4, and that radiation of a beta particle increases the atomic number by 1, but does not change the mass number. It was later found that emission of a positron decreases the atomic number by 1, but does not change the mass number. Gamma emission and isomeric transition change neither mass nor atomic number. Displacement laws are summarized as shown below. A change in atomic number means displacement in the periodic classification of the chemical elements; a change in mass number determines the radioactive series.


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