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Advantages of Mendeleev's Periodic table :- 

⇒ It was the base of Modern Periodic Table.
⇒ He left the empty spaces for the elements which could be known in the near future.
⇒He placed the noble gases on a corner of the table.
⇒Elements discovered by him shows similar chemical properties.

Disadvantages of Mendeleev's Periodic Table :- 

⇒Elements were placed in wrong order of their atomic Masses.
⇒ He could not explain the position of Hydrogen.
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Mark my best
Heya!  Medeleevs periodic table didnt have zero group...It was added later onn
And he didnt discover elementss.they were discovered later on..He just left spaces for 'em
very bad answer
Advantages >
|> His table formed the base for Modern periodic Table.
|> He left Blank spaces for appropriate elements.
|> It showed regular gradartion in physical and chemical properties of elements.

Disadvantages >
|> It could not define proper position for Hydrogen.
|> It was based on atomic masses of elements.For that an isotope of an element had to be placed differently.

Hope it will help you...!
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