Usefulness of the periodic table

1. Classification of the elements,
2. Prediction of undiscovered elements,
3. Correction of atomic weight,
4. Periodic table in industrial research,

Limitations of the periodic table:

1. Position of hydrogen,
2. Anomalies in Mendeleev’s table,
3. The position of rare earths,
4. The position of Actinides,
5. Oxidation states and the periodic table,
6. Properties which are not periodic functions,
7. Diagonal relationship