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achievements of mendeleev's periodic table???

Mendeleef 's contributions   :

1. Elements were arranged in increasing order of atomic weights in horizontal rows called periods and vertical  columns called groups .

2. Elements which are similar with respect to their chemical properties  are grouped together and have atomic weights of nearly the same value .

3.Elements in the same group -had the same valency and similar chemical properties .

4.Based on the periodicity of properties a number of gaps where left in the table for
 undiscovered elements that is elements now discovered example ,scandium ,gallium  and germanium originally called eka -boron ,eka -aluminium and eka -silicon respectively 

5.The properties of the undiscovered elements left in the vacant gaps was predicted .

6.Incorrect atomic weights of some of the arranged elements were corrected with the knowledge of the atomic weights of the adjacent elements .


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