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(C) Henry Moseley,in $1913$,conducted experiments using $X$-ray spectra of elements. He discovered that the frequency of the $X$-rays emitted by an el

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Henry Moseley

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(C) Henry Moseley,in $1913$,conducted experiments using $X$-ray spectra of elements. He discovered that the frequency of the $X$-rays emitted by an element is related to its atomic number $(Z)$ rather than its atomic mass. This led to the formulation of the Modern Periodic Law,which states that the properties of elements are a periodic function of their atomic numbers. Therefore,he demonstrated that atomic number is a more fundamental property of an element than atomic mass.

The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is:

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