Assertion(A): The noble gases are inactive.
Reason(R): These gases have a closed shell structure

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is True.

Explanation

To analyze the given question, we need to evaluate both the Assertion (A) and the Reason (R) separately and then determine if they are true or false, and if the Reason supports the Assertion.

### Step 1: Evaluate the Assertion (A)
**Assertion (A): The noble gases are inactive.**

- Noble gases, which include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn), are known for their lack of reactivity. This is primarily due to their electronic configuration.
- They have a complete valence shell, which means they do not readily gain or lose electrons. Therefore, the assertion that noble gases are inactive is **true**.

### Step 2: Evaluate the Reason (R)
**Reason (R): These gases have a closed shell structure.**

- The closed shell structure refers to the full occupancy of the outermost electron shell. For noble gases, this means that their outermost orbitals are completely filled (e.g., Neon has a configuration of 1s² 2s² 2p⁶).
- This full occupancy leads to stability and a lack of tendency to react with other elements. Thus, the reason that noble gases have a closed shell structure is also **true**.

### Step 3: Determine the Relationship
Now we need to check if the Reason supports the Assertion.

- The closed shell structure of noble gases explains why they are inactive. Since they do not need to gain or lose electrons to achieve stability, they do not participate in chemical reactions.
- Therefore, the Reason is a correct explanation of the Assertion.

### Conclusion
Both the Assertion (A) and the Reason (R) are true, and the Reason supports the Assertion.

### Final Answer
- Assertion (A) is true.
- Reason (R) is true and explains Assertion (A).

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