Which two criteria did mendeleev use to classify the elements in his periodic table? State mendeleev's periodic law. Why could no fixed position be given to hydrogen in mendeleev's periodic table?
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Mandaleev arranged all the elements in increasing order of their atomic masses.
Replaced all the elements with similar properties together
according to him the periodic properties of the elements are dependent on the atomic masses.
He did not give a specific position to hydrogen because of its unique nature
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