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aab-aabbb abb-abaa absolute scale analized Analysis of Levels bbaa-abab bbb-baa bbbb-aaab beryllium chapter Chemical Atoms chemical compound chemical elements Circular U67 classification levels compared computed configuration correct Diff differences in Section dissociation products doublets due to hydrogen elements excitation fluorine following schedule helium band helium level hot spark hydrogen atoms hydrogen band hydrogen deductions Hydrogen in Chemical hydrogen levels hydrogen line indicates Intensities of Combinations Interpretation of Spectra ionization potential isotope of Sub larger atomic number level designated Levels Classified levels evaluated levels in Table Levels of F I line molecules lines classified mass number multiplet neon atoms nitrogen null levels number differences occur oneanother opposite note order progressions order spectrum oxygen Paschen present produced s3 series s5 levels series formulas sodium spectral lines spectral systems spectrum classified Standards Circular subatoms suggested Table 15 Table 17 Revised table are accounted tion true series wave number