Question

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Answer 1

Explanation:

Mendeleev used the concept of atomic masses of the elements to create his periodic table. According to him, "The atomic masses of various elements are a periodic function of their chemical properties." This was the physical properties used by Mendeleev.

For chemical properties, he made the elements of his periodic table react with hydrogen and oxygen. Then he arranged the elements according to their chemical reactivity with hydrogen and oxygen.

Challenges posed to Mendeleev's Periodic Table:

• Some elements with dissimilar atomic masses were grouped together unlike elements with similar atomic masses, like Ni and Fe.
• There were no place for the isotopes to be placed in his periodic table when they were placed.

Hope my answer helps you..........

Answer 2

Answer:

The physical properties used by Mendaleevs were Density, Boiling Point and Melting Point. The Chemical Properties were Atomic Mass, Reaction with Oxygen and Chlorine. (1.) Position of Isotopes- Isotopes were discovered long after Mandleev gave his periodic table.

Explanation:

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