Number of neutrons in isotope of hydrogen, tritium is :

Options

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

Explanation

To find the number of neutrons in the isotope of hydrogen known as tritium, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Isotope**:
Tritium is an isotope of hydrogen. It is denoted as \( ^3H \) or \( T \).

2. **Understand the Components**:
- **Atomic Number (Z)**: The atomic number of hydrogen (and all its isotopes) is 1. This means it has 1 proton.
- **Mass Number (A)**: The mass number of tritium is 3. This is the total number of protons and neutrons in the nucleus.

3. **Use the Formula for Neutrons**:
The number of neutrons (N) in an atom can be calculated using the formula:
\[ N = A - Z \]
where \( A \) is the mass number and \( Z \) is the atomic number.

4. **Substitute the Values**:
For tritium:
- Mass number \( A = 3 \)
- Atomic number \( Z = 1 \)

Substitute these values into the formula:
\[ N = 3 - 1 \]

5. **Calculate the Number of Neutrons**:
\[ N = 2 \]

Thus, the number of neutrons in the isotope of hydrogen, tritium, is **2**.