Which of the following electronic configuration is not possible?

Options

A. `1s^(2), 2s^(2), 2p^(6)`
B. `1s^(2), 2s^(2), 2p^(7)`
C. `1s^(2), 2s^(2)`
D. `1s^(2), 2s^(2), 2p^(5)`

Explanation

To determine which electronic configuration is not possible, we need to analyze the given options based on the rules of electron configuration and the maximum number of electrons that can occupy each subshell.

### Step-by-Step Solution:

1. **Understand Electron Configuration**:
- Electrons are arranged in shells and subshells around the nucleus of an atom.
- The subshells are designated as s, p, d, and f, with each having a specific maximum number of electrons:
- s subshell can hold a maximum of 2 electrons.
- p subshell can hold a maximum of 6 electrons.
- d subshell can hold a maximum of 10 electrons.
- f subshell can hold a maximum of 14 electrons.

2. **Analyze the Options**:
- We need to look at the configurations provided in the options (not explicitly listed here) and identify any that violate the maximum electron capacity of the subshells.

3. **Identify the Incorrect Configuration**:
- In the provided video transcript, it is mentioned that option B has "P7".
- Since the p subshell can only hold a maximum of 6 electrons, having P7 (which implies 7 electrons) is not possible.

4. **Conclusion**:
- Therefore, the electronic configuration that is not possible is the one with P7.

### Final Answer:
The electronic configuration that is not possible is the one with P7.

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