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.

Academic Chemistry NCERT Class 10

The physical property used by Mendeleev in creating his periodic table was the atomic mass of an element. Melting and boiling points were also used as physical characteristics.

The chemical property used by Mendeleev in creating his periodic table was the nature of oxide and hydride formed ( i.e. similarity in chemical properties were used by Mendeleev).

The two observations that challenged Mendeleev's Periodic Law were:

Arranging elements according to the increasing order of atomic mass could not be maintained. Chemical properties do not depend on atomic mass.
Isotopes were not given any place in the table as they have different atomic mass but the same chemical properties.

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Updated on: 10-Oct-2022

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