Question

differences between mendeleev's arrangement of elements in his periodic table and modern periodic table.

Answer 1

Modern periodic law: The physical and chemical properties of elements are the periodic functions of the electronic configurations of their atoms

Mendeleev periodic law: the physical and chemical propertiesof the elements are the periodic functions of their atomic weights.

The limitations of Mendeleev periodic table are not in the modern periodic table.

Answer 2

Mendeleev's periodic table.

1. It consist of eight groups

2. Elements having arranged in increasing order of atomic masses.

3. isotopes where placed in different groups

4. He left some gaps in the table for undiscovered elements.

5.all the groups from first to eighth are divided into two subgroups

Modern periodic table

1. It consists of 18 groups

2. Elements have been arranged in increasing order of their atomic number

3. Isotopes were placed in the same group

4. All elements are filled in increasing order of atomic number no gaps left in the periodic table

5. No sub groups are there