The `SI` unit of radioactivity is curie.

Answer

To determine whether the statement "The SI unit of radioactivity is curie" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Radioactivity**:
- Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation. This can occur through the emission of alpha particles, beta particles, or gamma rays.

2. **Identifying the SI Unit of Radioactivity**:
- The SI unit of radioactivity is the becquerel (Bq). One becquerel is defined as one disintegration or decay per second.

3. **Understanding the Curie Unit**:
- The curie (Ci) is a non-SI unit of radioactivity. It is defined as 3.7 × 10^10 disintegrations per second.

4. **Comparing the Units**:
- Since the question states that the SI unit of radioactivity is curie, we need to clarify that the correct SI unit is actually the becquerel (Bq), not the curie (Ci).

5. **Conclusion**:
- Therefore, the statement "The SI unit of radioactivity is curie" is false.

### Final Answer:
The answer is **False**.

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