Question

Write the merits and demerits of mendeleev's periodic table

Answer 1

Answer:The merits and demerits of Mendeleeffs periodic table are:-

Merits:- Groups and sub-groups ,Periods, Predicting the properties of missing elements , Correction of atomic weights , Anomalous series .

Demerits;- Anomalous pair of elements , Dissimilar elements placed together

Answer 2

Answer:

Explanation:

Merits of Mendeleev Periodic Table

Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.

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. Hence, the number of elements yet to be discovered was not predictable.

Later on, isotopes of elements were found which violated Mendeleev’s periodic law

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