Radioactive iostope of hydrogen is:

Options

A. Uranium
B. Deuterium
C. Tritium
D. None of these

Explanation

To determine the radioactive isotope of hydrogen, let's analyze the options provided: Uranium, Deuterium, Tritium, or none of these.

### Step-by-Step Solution:

1. **Identify the Isotopes of Hydrogen**:
- Hydrogen has three isotopes:
- **Protium (¹H)**: This is the most common isotope, with one proton and no neutrons.
- **Deuterium (²H)**: This isotope has one proton and one neutron.
- **Tritium (³H)**: This isotope has one proton and two neutrons.

2. **Evaluate Each Option**:
- **Uranium**: This is a heavy metal and not an isotope of hydrogen. Therefore, it cannot be the answer.
- **Deuterium**: While it is an isotope of hydrogen, it is not radioactive. Thus, it is not the correct answer.
- **Tritium**: This isotope of hydrogen is radioactive. It undergoes beta decay, which makes it the only radioactive isotope among the three.

3. **Conclusion**:
- Based on the evaluation, the only radioactive isotope of hydrogen is **Tritium (³H)**.

### Final Answer:
The radioactive isotope of hydrogen is **Tritium**.

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