Assertion (A) : An orbital cannot have more than two electrons
Reason (R ) : The two electrons in an orbital create opposite magnetic fields

Options

A. If both (A) and (R ) correct and (R ) is the correct explanation for (A)
B. If both (A) and (R ) correct and (R ) is the correct explanation for (A)
C. If (A) is correct but (R ) is incorrect
D. If (A) is incorrect but (R ) is correct

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion (A):**
- The assertion states that "An orbital cannot have more than two electrons." This is a fundamental principle in quantum mechanics and is derived from the Pauli Exclusion Principle.

2. **Understanding the Reason (R):**
- The reason states that "The two electrons in an orbital create opposite magnetic fields." This is also true because electrons have a property called spin, which can be either +1/2 or -1/2. When two electrons occupy the same orbital, they must have opposite spins.

3. **Applying the Pauli Exclusion Principle:**
- According to the Pauli Exclusion Principle, no two electrons in an atom can have the same set of four quantum numbers. Since an orbital can hold a maximum of two electrons, they must have opposite spins to ensure their quantum numbers differ.

4. **Conclusion on the Assertion and Reason:**
- Since the assertion is correct (an orbital cannot have more than two electrons) and the reason is also correct (the two electrons create opposite magnetic fields), we can conclude that both statements are true.

5. **Determining the Relationship:**
- We need to check if the reason (R) is the correct explanation for the assertion (A). Since the reason explains why the assertion is true (the necessity of opposite spins to comply with the Pauli Exclusion Principle), we conclude that R is indeed the correct explanation for A.

**Final Conclusion:**
- Both the assertion (A) and reason (R) are correct, and R is the correct explanation for A.

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