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 Mendeleeves Periodic Law.

Answer 1

Answer:

Explanation:Mendeleev arranged the elements on the basis of their atomic mass.

Physical properties...

Melting and boiling point were used as the physical characteristics in deciding the position of elements.

Chemical Properties...

He arranged the elements and wrote the formula of their oxides and hydrides which seemed to possess same chemical formula.

The challenge were

Position of isotopes(which had same atomic mass)

The atomic mass was not increasing at each interval(coblat was placed before nickle)

Position of hydrogen can't be determined

Answer 2

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