Give limitations of Modern periodic table.

Limitations of the modern periodic table:

• Uncertainty regarding the position of hydrogen whether it should be placed in the IA group or VIIA group.​
• No place for isotopes of elements in the Modern periodic table.
• Lanthanides and Actinides are kept separately under the table not kept within the Modern periodic table.
• The modern periodic table could not explain the cause of periodicity, or separation of similar elements. Some dissimilar elements have been placed together.