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...Chapter chemical periodicity classification of the elements objectives explain why you can infer properties an element based on those other in periodic table use electron configurations to classify as noble gases representative transition metals or inner ghs honors chem revisited mendeleev s russian scientist dmitri grouped columns by similar taught chemistry terms order increasing atomic mass mid molar masses found some inconsistencies felt that were known more important than so switched wrote down also gaps must be undiscovered a pattern repeating predicted their before they modern are still same column moseley changed number this added didn t know about weren because react with anything horizontal rows called periods vertical groups there placed families group b outer p filling aa these and belong here alkali is halogens alkaline earth arranged h valence li configuration part atom another sees become ions cloud na obtain octet importantly outside orbitals electrons k fill up regular...