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...Periodic classification of elements module matter in our surroundings notes the last lesson you have studied about structure atoms and their electronic configurations also learnt that with similar show chemical properties by middle nineteenth century quite a large number nearly were known order to study these systematically it was considered necessary classify them this will undertake journey through development from ancient modern how some vary table objectives after studying be able describe briefly state main features mendeleev s explain defects law long form trends variation atomic size metallic character need for must visited chemist shop several hundred medicines are stored spite when ask particular medicine is locate easily possible because been classified into various categories sub arranged accordingly makes location an easy task science technology before beginning eighteenth only few so remember those compounds individually however more than sixty had discovered formed enormo...