Step 1: Understanding the Question:
Inner transition elements are the f-block elements (Lanthanides and Actinides). Step 2: Detailed Explanation:
1. Cm (Curium): It has atomic number 96 and belongs to the Actinide series. Actinides are inner transition elements.
2. W (Tungsten): It belongs to the 5d transition series (d-block).
3. Mo (Molybdenum): It belongs to the 4d transition series (d-block).
4. Ru (Ruthenium): It belongs to the 4d transition series (d-block). Step 4: Final Answer:
Cm (Curium) is an inner transition element.