Question

What is the merrit and dmerrit mendlivs 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. Hence, the number of elements yet to be discovered was not predictable.

Explanation:

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Answer 2

Answer:

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.

Disadvantages: 1. Anomalous pairs: Argon with atomic mass 39.9 precedes potassium with atomic mass 39.1. ... Position of isotopes: According to Mendeleev's periodic law, isotopes of an element must be given separate places in the periodic table since they have different atomic masses.