Chemistry
State the contributions made by Mendeleeff towards the periodic table.
Periodic Table
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Answer
The contributions of Mendeleeff towards the periodic table are:
- Elements were arranged in increasing order of atomic weights in horizontal rows called 'periods' and vertical columns called 'groups'.
- Elements which are similar with respect to their chemical properties are grouped together and have atomic weights of nearly the same value.
- Elements in the same group had the same 'valency' and similar chemical properties.
- Based on the periodicity of properties a number of gaps were left in the table for undiscovered elements i.e., elements now discovered e.g., Scandium, Gallium and Germanium originally called eka-boron,eka-aluminium and eka-silicon respectively.
- The properties of undiscovered elements left in the vacant gaps was predicted.
- 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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