Question

write demarits of modern periodic table?

Answer 1

Helloo
the position of hydrogen is unresolved. 

2. it fails to accomodate lanthanides and actinides in the main body. 

3. the electronic configuration of transitional elements is not reflected. 

4. Columns of elements help to distinguish groups in the periodic table. Elements within a group share several common properties and often have the same outer electron arrangement 

hope it helps

Answer 2

1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis.

2.The lanthanides and actinides have not been placed in the main body of the table.

3.Place of Multivalent elements is not sure in the modern periodic table.