Question

How does the modern periodic law differ from Mendeleev’s periodic law? Explain clearly group and periods in the modern periodic table.

Answer 1

Explanation:

Refer to the attached image.

Hope it helps you

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. Therefore are 18 groups.
4. Isotopes occupy the same position as the element.

Hope you understood mate!!!