Which can be used for carrying out nuclear reaction?

Options

A. Uranium – 238
B. Neptunium – 239
C. Thorium – 232
D. Plutonium – 239

Answer

### Step-by-Step Solution:

1. **Understanding Nuclear Reactions**:
- There are two main types of nuclear reactions: nuclear fusion and nuclear fission.
- **Nuclear Fusion**: This is the process where smaller atomic nuclei combine to form a larger nucleus. This typically occurs under extreme conditions, such as those found in stars.
- **Nuclear Fission**: This is the process where a larger atomic nucleus splits into smaller nuclei, along with the release of energy. This process is commonly used in nuclear reactors and atomic bombs.

2. **Identifying the Elements**:
- The question lists four elements: Uranium, Neptunium, Thorium, and Plutonium.
- All these elements are heavy elements and can undergo nuclear reactions.

3. **Determining the Type of Reaction**:
- Since the question asks which can be used for carrying out nuclear reactions, we need to focus on fission, as the elements listed are heavier and typically undergo fission rather than fusion.
- Among these elements, Uranium-235 and Plutonium-239 are specifically known for undergoing nuclear fission.

4. **Conclusion**:
- Since the question is about which element can be used for carrying out nuclear reactions, the answer is **Plutonium-239**.
- Plutonium-239 is a well-known fissile material that can sustain a nuclear chain reaction.

### Final Answer:
- The element that can be used for carrying out nuclear reactions is **Plutonium-239**.

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