Discuss three demerits of the modern periodic table.

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Solution

Three demerits of the modern periodic table
Position of Hydrogen:
Hydrogen has the properties of both alkali and halogens, but it was placed in alkali elements.
Position of Isotopes:
There were no places for Isotopes.
Position of Lanthanides and Actinides:
Lanthanides and Actinides were on the bottom of the table, not in the main body.

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