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(a)     What was the basis of Mandelev’s classification of elements ?
(b)     List two achievements of Mandelev’s periodic tables.
(c)     List any two observations which posed a challenge to Mandelev’s periodic law.

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(a) Atomic Mass

(b) Achievements

He left some gaps in periodic table fro elements to be discovered in future
He could easily classify all the 63 elements known at that time

(c) Observations which posed a challenge ti Mendeleev's Periodic Law

Position of Isotopes
He placed some elements in the wrong order of their increasing atomic mass.

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Sumit Saini

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