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(B) Henry Moseley,through his experiments on $X$-ray spectra of various elements,demonstrated that the frequency of $X$-rays emitted by an element is

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Moseley's $X$-ray spectroscopy work

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(B) Henry Moseley,through his experiments on $X$-ray spectra of various elements,demonstrated that the frequency of $X$-rays emitted by an element is related to its atomic number $(Z)$ rather than its atomic mass.This discovery led to the formulation of the Modern Periodic Law,which states that the physical and chemical properties of elements are a periodic function of their atomic numbers.

The modern periodic table,based on the experiment of atomic number which highlights the significance of atomic number,is associated with:

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