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Moseley's law
Law concerning X-rays emitted by atoms / From Wikipedia, the free encyclopedia
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Moseley's law is an empirical law concerning the characteristic X-rays emitted by atoms. The law had been discovered and published by the English physicist Henry Moseley in 1913–1914.[1][2] Until Moseley's work, "atomic number" was merely an element's place in the periodic table and was not known to be associated with any measurable physical quantity.[3] In brief, the law states that the square root of the frequency of the emitted X-ray is approximately proportional to the atomic number:
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