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 electron enters into f-subshell of the antepenultimate óbit are called inner-transition elements. They include lanthanoids ( 58-71 ) in which the last electron enters 4 subshell and actinoids (90-103) in which the last electron enters 5f subshell. The elements with atomic number 59,95 and 102 are inner transi. tion elements.