Which of the following electronic configuration represent noble gas

Options

A. `ns^2 np^6`
B. `ns^2 np^5 `
C. `ns^2 np^4`
D. `ns^2 np^3`

Explanation

To determine which electronic configuration represents a noble gas, we need to understand the characteristics of noble gases. Noble gases are elements that have completely filled outer electron shells, which typically corresponds to having a complete octet (8 electrons in their valence shell) for all noble gases except helium, which has a complete duet (2 electrons in its valence shell).

### Step-by-Step Solution:

1. **Identify Noble Gas Characteristics**:
- Noble gases have fully filled outer electron shells.
- For most noble gases, this means having 8 electrons in the outermost shell (octet), except for helium, which has 2 electrons (duet).

2. **Analyze Given Electronic Configurations**:
- Look at the electronic configurations provided in the options and check the number of electrons in the outermost shell.

3. **Option Evaluation**:
- **Option 1**: Check if the outermost shell has 8 electrons (complete octet).
- If it has 8 electrons, this option represents a noble gas.
- **Option 2**: Check if the outermost shell has 8 electrons.
- If it has less than 8 electrons, this option does not represent a noble gas.
- **Option 3**: Repeat the same check as above.
- **Option 4**: Again, check the outermost shell.

4. **Conclusion**:
- After evaluating all options, identify which one has a complete octet (8 electrons) or a complete duet (2 electrons for helium).
- The only option that meets the criteria for being a noble gas is **Option 1**.

### Final Answer:
- **Option 1** represents a noble gas configuration.