Question

Give any two difference between mendeleevs and Modern periodic table

Answer 1

Explanation:

The main differences are: Mendeleev's periodic table is based on atomic mass. Modern periodic table is based on atomic number. ... In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time).

Answer 2

• 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!!!