Which one of the following is a possible nuclear reaction ?

Options

A. `._(10)^(5)B + ._(2)^(4)He rarr ._(7)^(13)N + ._(1)^(1)H`
B. `._(11)^(23)Na + ._(1)^(1)H rarr ._(10)^(20)Ne + ._(2)^(4)He`
C. `._(93)^(239)Np rarr ._(94)^(239)Pu + ._(-1)beta^(0) + bar(v)`
D. `._(7)^(11)N + ._(1)^(1)H rarr ._(6)^(12)C + ._(-1)beta^(0) + bar(v)`

Answer

To determine which of the given nuclear reactions is possible, we need to check if the equations are balanced in terms of both mass number (A) and atomic number (Z). A balanced nuclear reaction will satisfy the conservation of mass and charge.

### Step-by-Step Solution:

1. **Understand the Components of a Nuclear Reaction**:
- A nuclear reaction can be represented as:
\[ \text{Reactants} \rightarrow \text{Products} \]
- Each component has a mass number (A) and atomic number (Z).

2. **Check the Given Reactions**:
- We need to analyze each of the four reactions provided to see if they are balanced.

3. **Analyze Each Reaction**:
- **Reaction 1**:
\[ 10 + 2 \rightarrow 7 + 1 + 13 \]
- Left Side: Mass number = 10 + 2 = 12; Atomic number = 0 (not given).
- Right Side: Mass number = 7 + 1 + 13 = 21; Atomic number = 0 (not given).
- **Conclusion**: Not balanced.

- **Reaction 2**:
\[ 11 + 1 \rightarrow 10 + 2 \]
- Left Side: Mass number = 11 + 1 = 12; Atomic number = 0 (not given).
- Right Side: Mass number = 10 + 2 = 12; Atomic number = 0 (not given).
- **Conclusion**: Balanced.

- **Reaction 3**:
\[ 8 + 8 \rightarrow 5 + 11 + 1 \]
- Left Side: Mass number = 8 + 8 = 16; Atomic number = 0 (not given).
- Right Side: Mass number = 5 + 11 + 1 = 17; Atomic number = 0 (not given).
- **Conclusion**: Not balanced.

- **Reaction 4**:
\[ 12 + 4 \rightarrow 8 + 8 \]
- Left Side: Mass number = 12 + 4 = 16; Atomic number = 0 (not given).
- Right Side: Mass number = 8 + 8 = 16; Atomic number = 0 (not given).
- **Conclusion**: Balanced.

4. **Final Evaluation**:
- Among the four reactions, only Reaction 2 is balanced in terms of both mass number and atomic number. Therefore, it is the only possible nuclear reaction.

### Conclusion:
The possible nuclear reaction is **Reaction 2**.