Question

Give two limitation of modern periodic table.

Answer 1

Limitations of modern periodic table:

i. Uncertainty regarding the position of hydrogen whether it should be placed in IA group or VIIA group.

ii. No place for isotopes in the Modern periodic table.

iii. Lanthanides and Actinides kept separately under the table not kept within the Modern periodic table.

Answer 2

1. There is no proper place for hydrogen in the Periodic Table. It is placed into group 1 or 17, but none of these are suitable to take account of all hydrogen properties. Helium is also strangely placed in the noble gas group, despite its 1s² configuration differing from ns²np⁶ configuration of another members.

2. Some alternative tables includes neutron as null atomic number element. This is not feasible in the traditional Periodic Table.