Question

different between the arrangement of elements in Mendeleev periodic table and Modern period table

Answer 1

In Mendeleev's Periodic Table, the elements were organised on the basis of mass; but in Modern Periodic Table, this organisation is on the basis of atomic numbers.............

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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!!!