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 the f-subshell are called inner-transition elements. These include lanthanoids (58-71) and actinoids (90-103). Accordingly, elements with atomic numbers 59-95 and 102 are inner transition elements.