The frequencies of the lines in the X-ray spectra of the elements are related to the atomic numbers of the elements. If the square roots of the frequencies of corresponding lines of a set of elements are plotted against the atomic numbers a straight line is obtained. The law was discovered by H. G. Moseley (1887–1915).
http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Moseley-article.html Original paper on the law
Subjects: Chemistry — Physics.