Henry Moseley was born in Great Britain in 1887. His work with x-ray spectra to study atomic structure helped determine atomic numbers for chemical elements. He discovered isotopes, explaining how atomic mass did not order the elements appropriately. Moseley was the catalyst for the periodic law, a rule stating that the properties of elements are a periodic function of their atomic numbers. Using the atomic numbers, Moseley was able to more accurately position the elements in the periodic table. Moseley's change to the periodic table allowed the few problems with Mendeleev's periodic table to disappear.
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