Chemistry - f-block Question with Solution | TestHub

Question Explanation:

Counting the number of inner transition elements from a list of atomic numbers. Concept:

The Periodic Table (f-Block).

Solution:

The inner transition elements ( f -block) consist of the lanthanides ( $\mathrm{Z}=58-71$ ) and the actinides ( $\mathrm{Z}=90-103$ ). We check which of the given atomic numbers fall within these ranges.

29, 74, 104, 72: d-block.

57, 89: d-block (first elements of their respective series).

59 (Pr), 95 (Am), 102 (No): These are inner transition elements.

59, 95, 102 are inner transition elements.