本题目来源于试卷: Models of Matter A.3 Electron Configurations，类别为 IB化学
[单选题]
Which of the following represents the correct ground state electron configuration of chromium?
A. $1s^22s^22p^63s^23p^63d^44s^2$
B. $1s^22s^22p^63s^23p^64s^24d^4$
C. $1s^22s^22p^63s^23p^63d^54s^1$
D. $1s^22s^22p^63s^23p^64s^14d^5$
参考答案: C
本题详细解析:
The electron configuration of chromium (Cr) is unusual because it violates the
vp ;y3derm(daoh9asln; /+6u
'Aufbau Principle', which states that electrons will fill orbrs + vndh/ 39aead;lu6y (;ompitals in order of increasing energy.
Normally, the 4s orbital would be filled before the 3d orbital, since the 4s orbital has a lower energy level than the 3d orbital.
The electron configuration $1s^22s^22p^63s^23p^63d^54s^1$ is more stable because it maximizes the number of half-filled and completely filled d orbitals, which are energetically favorable. Half-filled and completely filled d orbitals are more stable than partially filled d orbitals, due to electron-electron repulsion effects.
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