Question

What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleev’s Periodic Law.

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Answer 1

Answer:

The chemical property used was the nature of oxide and hydride formed i.e. similarity in chemical properties were used by Mendeleev. The two observations that posed challenge in Mendeleev Periodic Law were: i Arranging elements according to the increasing order of atomic mass could not be maintained

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Answer 2

Answer:

Arranging elements according to the increasing order of their atomic masses could not be maintained

Explanation:

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