Question

Drawbacks of modern periodic table ?

Answer 1

1-The position of hydrogen is not settled. It resembles with alkali metals as well as halogens. However, it has been placed with alkali metals.

2-Lanthanoids and actinoids have not been accommodated in the main body of the periodic table.They are at the bottom,which is a defect.

Thanks.
Tripathy

Answer 2

Answer:

Position of hydrogen is not satisfactory, it can be placed either in group I or 17 group of the first period.