Question

What's difference between modern periodic table and Mendeleev's original table?

Answer 1

you may find it on pages 82-86 of class 10 ncert...

Answer 2

Answer:

• Mendeleev's periodic table

1. elements are arranged in increasing order of their atomic masses.
2. If 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. Therefore are 18 groups.
4. Isotopes occupy the same position as the element.

Hope you understood mate!!!