To solve the question, we need to analyze the assertion and the reason provided:
### Step-by-Step Solution:
1. **Understanding the Assertion**:
- The assertion states that for an element, generally \( N \geq Z \), where \( N \) is the number of neutrons and \( Z \) is the atomic number (which is equal to the number of protons).
- This means that in many elements, especially heavier ones, the number of neutrons is greater than or equal to the number of protons.
2. **Analyzing the Assertion**:
- For lighter nuclei, the number of protons (Z) is often equal to the number of neutrons (N).
- However, as we move to heavier nuclei, the number of protons increases, leading to increased electrostatic repulsion among protons.
- To counteract this repulsion and maintain nuclear stability, additional neutrons are required. Hence, \( N \) tends to be greater than \( Z \) in heavier elements.
- Therefore, the assertion is **true**.
3. **Understanding the Reason**:
- The reason states that neutrons always experience attractive nuclear forces.
- Neutrons do not carry an electric charge, so they do not experience electrostatic repulsion. Instead, they are subject to the strong nuclear force, which is indeed attractive.
- This statement is also **true**.
4. **Evaluating the Relationship**:
- Although both the assertion and the reason are true, the reason does not explain the assertion correctly.
- The assertion is about the relationship between neutrons and protons in terms of their numbers, while the reason discusses the nature of the forces acting on neutrons.
5. **Conclusion**:
- Since both the assertion and the reason are true but the reason does not provide a correct explanation for the assertion, the correct answer is:
- **Assertion and Reason are true, but Reason is not the correct explanation for Assertion.**
### Final Answer:
The correct option is **B**: Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
