1.

The number of elements in each of the inner transition series is

Answer»

2
8
10
14

Solution :Lanthanides- The `14` elements form `._(58)Ce-_(71)Lu` in which 4F subshell is being PROGRESSIVELY filled up are called lanthanides or rare earth elements . Actinides-Similarly, the `14` elements from `._(90)TH-_(103)LR` in which 5f-subshell is being progressively filled up are called actinides.


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