Question

differntiate between the arrangement of elements in mendeleevs periodic table and modern periodic table

Answer 1

Mendeleev arranged all the known63 elements according to their increasing atomic masses while in modern periodic table elements are arranged in increasing atomic number .

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.

Hope you understood mate!!!