题目

Years ago I moved to Woodland Hills to take a job in a small hospital’s emergency department. No one wanted to work on Christmas Eve, so the shift（轮班）went to me. I kissed my family goodbye and went off to spend the night in the hospital. It was a thankless job. At 9 pm, the ambulance brought in a man in his 60s who was having a heart attack. His face was pale, and he was frightened. The whole night I did my best to save his life. Before I left in the morning to spend Christmas with my family, I stopped by to see how he was doing. It was still tough, but he had survived the n下列说法不正确的是（　　）A．当碳原子的核外电子排布由1s22s22p2转变为1s22s12p3时，碳原子由基态变为激发态B．3d能级中电子排布的情况可以为C．电子构型为[Ar]3d54s2的元素是过渡元素D．在电子云示意图中，小黑点密度大表示电子在核外空间单位体积内电子出现的机会多