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...Periodic classification introduction till to day elements have been discovered it is quite difficult remember the properties of all and their compounds solve this problem attempts were made from time group with similar thus knowing one element other in a can be known mendeleev s mandeleef russian chemist gave table more complete form he even predicted existence which not then at that only law are function atomic masses arranged these order increasing spaces where suited them an its number advantages when published his some i prediction new mandeleeff there many vacant would occupy places as few later they found exactly told by according positions ii correction mass we know present particular vertical column identical chemical on basis placed second along mg ca sr ba divalent beryllium was should after carbon whose determined equivalent exact multiplying since metal iii structure helped making comprehensive study electronic configurations defects under anomalous position ascending potas...