Question

List any two differences between mendeleevs periodic table and modern periodic table

Answer 1

Mendeleeves periodic table ::-

Found by Dmitri Mendeleeve.

1) Elements are arranged according to their atomic masses.

2.) No place for isotopes.

3.) Had controversies about arrangements of some elements like hydrogen , cobalt and nickel, etc.

Mendeleeves periodic law::- Properties of Elements are a periodic function of their atomic masses.

Modern Periodic table::-

Found by Henry Mosley

1.) Elements were arranged according to their atomic numbers

2.) Had place for isotopes.

3.) No controversies about any Elements as they were arranged according to the their atomic no.s.

Modern periodic law::- Properties of Elements are a periodic function of their atomic numbers.

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Answer 2

Answer:

• Mendeleev's periodic table

1. elements are arranged in increasing order of their atomic masses.
2. It is not divided into any blocks.
3. There are 8 groups.
4. Isotopes could not be placed properly.

• Modern periodic table

1. Elements are arranged in increasing order of their atomic numbers.
2. It is divided into four blocks, namely s-block,p-block,d-block and f-block.
3. There are 18 groups.
4. Isotopes occupy the same position as the element.

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