The Development of the Periodic Law |
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according analogies analogous elements arithmetical arranged atomic volumes atomic weight differences atomic weights Berzelius carbon Chancourtois character chemical elements chemistry chemists chlorine composite nature compounds condensation constant corresponding curve density determined diagram DIFF discovery Döbereiner Dumas equivalents existence expressed fact forms of matter formula function further gave give given homologous series hydrogen hypothesis of Prout idea increase known lines lithium Lothar Meyer mass mean Mendeléeff ments metals Meyer molecule MONAD multiples Newlands nitrogen group numerical relations observed Octaves organic chemistry oxygen paper periodic functions Periodic Law periodic system position primal elements primal matter properties Prout's hypothesis Prout's Law radicals ratio regarded regular represent series of elements seven similar simple bodies specific gravities spectra spectrum speculations spiral substances temperature theory tion triads unit unity of matter valence vertical whole numbers yttrium