QQuestionChemistry
QuestionChemistry
Which of the following electronic configurations violates the Aufbau principle in creating a ground state electronic configuration?
[Ne] 3s²
[Ne]
[Ne] 3s² 3p⁴
[Ne] 3s¹ 3p⁴
[Ne] 3s² 3p²
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Answer
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Step 1:I'll solve this step by step, focusing on the Aufbau principle and electronic configuration rules.
Step 2:: Understanding the Aufbau Principle
The Aufbau principle states that electrons fill orbitals from lowest to highest energy level, following these key rules: - Electrons fill orbitals in order of increasing energy - Each orbital can hold a maximum of 2 electrons with opposite spins - Lower energy orbitals must be filled before higher energy orbitals
Step 3:: Analyzing the Electronic Configurations
Let's examine each configuration systematically:
Step 4:[\mathrm{Ne}] 3s^{2}
- This configuration fills the 3s orbital with 2 electrons - Follows Aufbau principle ✓
Step 5:[\mathrm{Ne}]
- This is an incomplete configuration - Violates Aufbau principle ✗
Step 6:[\mathrm{Ne}] 3s^{2} 3p^{4}
- Fills 3s with 2 electrons, then 3p with 4 electrons - Follows Aufbau principle ✓
Step 7:[\mathrm{Ne}] 3s^{1} 3p^{4}
- Partially fills 3s with 1 electron, then 3p with 4 electrons - Violates Aufbau principle ✗
Step 8:[\mathrm{Ne}] 3s^{2} 3p^{2}
- Fills 3s with 2 electrons, then 3p with 2 electrons - Follows Aufbau principle ✓
Step 9:: Identifying Violations
- $$[\mathrm{Ne}] 3s^{1} 3p^{4}$$ (uneven filling of 3s orbital)
Configurations that violate the Aufbau principle:
Final Answer
[\mathrm{Ne}] and [\mathrm{Ne}] 3s^{1} 3p^{4} violate the Aufbau principle.
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