Question

Write down five major difference b/w mendeleev's periodic table and modern periodic table

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Answer 1

Answer:

Mandaleevs periodic table is based on atomic mass .

modern periodic table is based on atomic number.

Mandaleevs periodic table contains about 66 elements.

Modern periodic table contains presently 118 elements.

In Mandaleevs periodic table there were gaps for undiscovered elements.

Modern periodic table maintains uniformity.

In Mandaleevs periodic table noble gases were not placed.

In Modern periodic table noble gases in a separate group named as group 18.

In Mandaleevs periodic table transition elements included with other elements.

In Mordern periodic table transition elements placed in separate block