The total number of isotopes of hydrogen and number of radioactive isotopes amonge them, respectively, are :

Options

A. 3 and 1
B. 3 and 2
C. 2 and 1
D. 2 and 0

Explanation

To solve the question regarding the total number of isotopes of hydrogen and the number of radioactive isotopes among them, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Isotopes**:
- Isotopes are atoms of the same element that have the same atomic number but different mass numbers. This means they have the same number of protons but a different number of neutrons.

2. **Identify the Isotopes of Hydrogen**:
- Hydrogen has three main isotopes:
- **Protium (¹H)**: This isotope has 1 proton and 0 neutrons. Its mass number is 1.
- **Deuterium (²H)**: This isotope has 1 proton and 1 neutron. Its mass number is 2.
- **Tritium (³H)**: This isotope has 1 proton and 2 neutrons. Its mass number is 3.

3. **Count the Total Number of Isotopes**:
- From the above, we can see that there are a total of **3 isotopes of hydrogen**: Protium, Deuterium, and Tritium.

4. **Identify Radioactive Isotopes**:
- Among these isotopes, Tritium (³H) is known to be radioactive. It undergoes beta decay and has a half-life of about 12.3 years.
- Protium and Deuterium are stable and not radioactive.

5. **Count the Number of Radioactive Isotopes**:
- Therefore, there is **1 radioactive isotope** of hydrogen, which is Tritium.

6. **Final Answer**:
- The total number of isotopes of hydrogen is 3, and the number of radioactive isotopes among them is 1.

### Conclusion:
The answer to the question is: **3 and 1**.