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...Chapter periodic classification of elements multiple choice questions upto which element the law octaves was found to be applicable a oxygen b calcium c cobalt d potassium were according mendeleev s arranged in table order increasing atomic number decreasing masses gaps left for discovered later following place perioidc germanium ncert chlorine silicon statement about modern are incorrect i on basis their ii iii isotopes placed adjoining group not republished iv only and statements is correct it has horizontal rows known as periods vertical columns groups given e with respectively belong same period have pair where would you locate electronic configuration an essential constituent all organic compounds belongs outermost shell k l m n one exhibit maximum valence electrons na al si p gives radii o f among largest mg ca lose electron easily does characteristics show physical properties chemical exemplar problems science arrange metallic character cl non li...