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一道SAT2化学题Which of the following electron configurations repr

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一道SAT2化学题
Which of the following electron configurations represents an atom of magnesium in an excited state?
A.1s2 2s2 2s6
B.1s2 2s2 2p6 3s2
C.1s2 2s2 2p5 3s2 3p2
D.1s2 2s2 2p6 3s1 3p1
E.1s2 2s2 2p6 3s1 3p2
为什么?
首先,excited后电子数量与原来的原子的电子数量相同,从这个角度上来说选D.其次,镁应该是1s2 2s2 2p6 3s2,excited之后3s层中一个电子跃迁到下一个亚层,也就是3p层,因此应该选D
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