Question

differentiate between the arrangements of elements in Mendeleev periodic table and Modern Periodic Table

Answer 1

According to the mendeleev:s periodic table,the phyisical and chemical properties of elements are a function of their atomic masses but the modern periodic table states that the physical and chemical properties of elements are a periodic function of their atoic numbers.

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!!!