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 i(m5b t-+m zyf(Cr) is unusual because it violates the
'Aufbau Principle', which states that electrons will fill orbitals 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 configurai-fy +mbm5t z(tion $1s^22s^22p^63s^23p^63d^54s^1$ 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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