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On the basis of which important property did Mendeleev classify the elements in his periodic table? Was he able to stick to it firmly? Explain.
(N/A) Mendeleev classified the elements in his periodic table based on their $Atomic \ Mass$. He could not stick to it firmly because he had to prioritize the similarity in physical and chemical properties of elements over the strict adherence to increasing atomic mass,leading to some anomalies.
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