Question

differentiate between the arrangement of electrons elements in Mendeleev periodic table and Modern Periodic tables

Answer 1

mendeleev's periodic table

1)It is based on the atomic mass.

2) All elements where not present in his periodic table.

3)position of hydrogen.

4) position of zero group or inert gas was not there.

Modern periodic table

It is based on atomic number.

position of Hydrogen also not fixed

3)position of inert gas or zero group fixed.

4)All the elements are mostly present

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!!!