Electronic Configuration
The electronic configuration of chromium (Z = 24) is:
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About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- electronic configuration
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
[Ar] 3d⁵ 4s¹
Expected configuration using Aufbau principle for Z=24 is [Ar]3d44s2. However, Chromium (Cr) and Copper (Cu) show anomalous configurations due to the extra stability of half-filled and completely filled subshells.
- In Cr, an electron from the 4s orbital jumps to the 3d orbital to make 3d5 (exactly half-filled) and 4s1 (exactly half-filled).
- Correct configuration: [Ar]3d54s1.
This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of electronic configuration. It appeared in the 2025 exam.
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