Question

drawbacks of Mendeleev's Periodic table ?​

Answer 1

Answer:

Demerits of Mendeleev Periodic Table

• He was unable to locate hydrogen in the periodic table.
• Increase in atomic mass was not regular while moving from one element to another. ...
• Later on, isotopes of elements were found which violated Mendeleev's periodic law.

Answer 2

Answer:

HI !

Drawbacks/Demerits of Mendeleev's periodic table :-

1) Hydrogen's position

Hydrogen 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 Isotopes

Isotopes are those with same atomic no: and different mass no:s.

Mendeleev's periodic 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 Nickel

Cobalt being more heavier than Nickel ,was placed before Nickel , in the Mendeleev's periodic table.

Explanation:

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