Recent discovery of the laws of atomic electron shells formation [1] enables to have absolutely new view at the nature of atom spectrum. In particular, the fractional values of a main quantum number testify to excitation of multiple resonances of electronic shells of atoms making for each atom a «special» spectrum. In spite of all diversity of characteristics the regularities showing harmonic unity of each atom clearly appear, that, undoubtedly, becomes reliable guiding line for researchers and will be useful at the analysis and systematization of atomic spectrums. This article is a continuation of study of atomic electron shells properties on the basis of reference data confirmed by trusty experiments.