Lanthanides and actinides resemble in

Lanthanides and actinides are placed in separate rows at the bottom of the periodic table. Explain the reason for this arrangement ?

Lanthanides and actinides are placed in separate rows at the bottom of the periodic table. Explain the reason for this arrangement ?

Lanthanides and actinides are placed in separate rows at the bottom of the periodic table. Explain the reason for this arrangement ?

Assertion : f-block elements are called inner transition elements Reason : Lanthanides and actinides are inner transition elements

What were the main demeris of mendeleev's periodic table? (i)Hydrogen has been places in group I though it resembles to group VII as well (ii)Position of some elements was not justified (iii)Isotopes were not given separate places. (iv)Lanthanides and actinides were not included in the table.

What were the main demerits of Mendeleev's periodic table? (i)Hydrogen has been places in group I though it resembles to group VII as well (ii)Position of some elements was not justified (iii)Isotopes were not given separate places. (iv)Lanthanides and actinides were not included in the table.