The kind of spectra used to measure the atomic number of elements is X-ray spectra.
The atomic number of elements is the number of protons in the nucleus of the element. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.
In 1913, Mosely demonstrated that the atomic number of elements can be obtained from the X-ray spectra of elements. Using this method, he arranged the elements in order of increasing atomic number.
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