Spectral Series, The Moseley Law

By definition, a spectral series is a group of homologous lines, e.g., the Kai lines or Lai lines, etc. of all the elements. In 1913, Moseley established an 

The X-ray energies of various Ka and La lines increase as a smooth function of the atomic number Z according to the Moseley law E = Zes Here n indicates the lower energy level e.g., 1 for K X-rays, 

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