- **Curium** is a chemical element in the actinide series.
- It's denoted by the **chemical symbol "Cm"**, which is option 2.
- **Cr** is the chemical symbol for **Chromium**, not Curium.
- **Ci** is not a recognized chemical symbol for any element.
- **Cu** is the symbol for **Copper**.
- You highlighted option 2: Cm, which is the right symbol for Curium.

Your Answer: **Option 2 - Cm** ✅

YOUR ANSWER IS RIGHT