Question

initiate between the arrangement of element in Mendeleev periodic table and Modern Periodic Table

Answer 1

Main difference between arrangement of elements in mendeleev's and modern periodic table is in Mendeleev's periodic is based on atomic mass while modern periodic table is based on 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!!!