8.28 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.

Inner transition metals are those elements in which the last electron enters the f-orbital. 

The elements in which the 4f and the 5f orbitals are progressively filled are called f-block

elements. Among the given atomic numbers, the atomic numbers of the inner transition

elements are 59, 95, and 102.

Praseodymium is 59
Americium is 95
Nobelium is 103