Mendaleev’s periodic table:
1. In this table, the elements are arranged in the order of their increasing atomic weights
2. In this table, the position of an element is based on its properties and atomic weight.
3. There are 8 groups in this table.
4. In this table, some elements having similar properties are found in different groups, while those having different properties are sometimes found in the same group.
5. Isotopes do not find separate places in this table.
Modern periodic table:
1. In this table, the elements are arranged in the order of their increasing atomic number.
2. In this table, the position of an element, is based on its electronic configuration.
3. There are 18 groups in this table.
4. In this table, the elements belonging to the same group show similar chemical properties.
5. Isotopes of an element can be placed at the same place as their atomic number is the same.
