What is the need to classify elements ?

Explanation

1 ) BY the end of `17 ^(th ) ` century about 13 elements were known .Towards the end of `18 ^(th ) ` century another 11 elements were discovered .
2 ) By 1865 . About 63 elements were known and by 1940 .A total of 91 elements from natural sources and another 17 elements synthetically were obtained .
3 ) By now including syntheric elements there are more than 115 elements .
4 ) As the number of elements increasesed , it became different to keep in memory the chemisteries of induvidual elements and their compounds
5 ) The classification of elements into metals and non metals had so many limitations So there was a need to classify them in other ways .
6 ) hence chemists started to frame ways d to group these elements and compounds on the basis of their physical and chemical properties .