Give three drawbacks of Mendleev's Periodic Table.P

1.	Give three drawbacks of Mendleev's Periodic Table.P
Answer» Drawbacks/Demerits of Mendeleev's periodic table :- 1) Hydrogen's positionHydrogen resembled the properties of both alkali metals(like lithium) and also that of halogens(like iodine). Hence, the position of hydrogen(whether hydrogen is to be placed with halogens or alkali metals) was not specified. 2) Position for IsotopesIsotopes are those with same atomic no: and different mass no:s.Mendeleev'speriodic table was based on arranging elements in increasing order of atomic masses. But isotopes were not included in his periodic table. 3) Certain elements were arranged in reverse order. Elements having higher atomic mass were placed in front(or before) the elements with less atomic mass. Example - Cobalt and NickelCobalt being more heavier than Nickel ,was placed before Nickel , in the Mendeleev's periodic table. hit like if you find it useful

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Drawbacks/Demerits of Mendeleev's periodic table :-

1) Hydrogen's positionHydrogen resembled the properties of both alkali metals(like lithium) and also that of halogens(like iodine). Hence, the position of hydrogen(whether hydrogen is to be placed with halogens or alkali metals) was not specified.

2) Position for IsotopesIsotopes are those with same atomic no: and different mass no:s.Mendeleev'speriodic table was based on arranging elements in increasing order of atomic masses. But isotopes were not included in his periodic table.

3) Certain elements were arranged in reverse order. Elements having higher atomic mass were placed in front(or before) the elements with less atomic mass. Example - Cobalt and NickelCobalt being more heavier than Nickel ,was placed before Nickel , in the Mendeleev's periodic table.

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