Which of the following represents noble gas configuration?

Options

A. `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6)`
B. `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4f^(14) 5s^(2) 5p^(6) 5d^(1)`
C. `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6) 5d^(1) 6s^(2)`
D. `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) 4s^(2) 4p^(6) 4d^(10) 5s^(2) 5p^(6) 5d^(6) 6s^(2)`

Answer

To determine which of the given options represents a noble gas configuration, we need to understand what noble gas configuration means. Noble gas configuration refers to the electron configuration of an atom that has a full outer shell of electrons, typically resembling that of the nearest noble gas.

### Step-by-Step Solution:

1. **Understand Noble Gas Configuration**:
- Noble gases have complete outer electron shells. For example, helium (He) has 2 electrons, neon (Ne) has 10 electrons, argon (Ar) has 18 electrons, krypton (Kr) has 36 electrons, and xenon (Xe) has 54 electrons. The general rule is that the outermost shell can hold a maximum of 8 electrons (octet rule), except for the first shell which can hold 2.

2. **Analyze the Options**:
- Look at the electron configurations provided in the options. We need to identify which configuration has a complete outer shell.

3. **Evaluate Each Option**:
- **Option A**: 5s² 5p⁶
- This configuration indicates that the outermost shell (n=5) has 2 electrons in the s subshell and 6 electrons in the p subshell, totaling 8 electrons. This matches the noble gas configuration of xenon (Xe).
- **Option B**: 5d¹
- This configuration has only 1 electron in the d subshell, which does not represent a complete outer shell.
- **Option C**: 5d¹ 6s²
- Here, the 5d subshell has 1 electron and the 6s subshell has 2 electrons. The 5d subshell is not filled, so this does not represent a noble gas configuration.
- **Option D**: 5d⁶
- This configuration has 6 electrons in the d subshell. The d subshell can hold a maximum of 10 electrons, so it is not filled, and thus does not represent a noble gas configuration.

4. **Conclusion**:
- The only option that represents a noble gas configuration is **Option A: 5s² 5p⁶**, which corresponds to the electron configuration of xenon.

### Final Answer:
**Option A: 5s² 5p⁶ represents noble gas configuration.**