What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements : 29, 59, 74, 95, 102, 104.

Explanation

The f-block elements, i.e., in which the last electron enters into f-subshell are called inner-transition elements. These include lanthanoids `(58-71)` and actinoids `(90-103)`. Thus, elements with atomic numbers, `59,95` and `102` are inner transition elements.