The chief contribution of physicist Henry Moseley to atomic theory was

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Henry Moseley's chief contribution to atomic theory was the measurement of the atomic numbers of elements. By examining the X-ray spectra of different elements, he found that each element had a unique atomic number that correlated with its position on the periodic table. This helped to refine the understanding of the structure of atoms and their arrangements in the periodic table.

The Chief Contribution of Physicist Henry Moseley to Atomic Theory