What were the achievements of Mendeleev's periodic table? what were the basic properties of elements considered by Mendeleev for their classification?

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Achievements of Mendeleev's periodic table
Prediction of new elements: The existence and properties of elements that are similar to Boron/Aluminum/Silicon is predicted by Mendeleev.
He left the gap after some elements and gave them hypothetical names such as Eka-Aluminium/Eka-Silicon.
He also predicted some general physical properties of gallium and germanium.
Basic properties of the element
The physical and chemical properties of elements are a periodic function of their atomic weights.
He took more similarities in properties than to atomic mass in the arrangement such as Iodine has a smaller weight than Tellurium but it was placed after it.

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