下列说法或有关化学用语的表达正确的是( )
A．在基态多电子原子中，p轨道电子能量一定高于s轨道电子能量
B．基态Fe原子的外围电子排布图为：
C．因氧元素电负性比氮元素大，故氧原子第一电离能比氮原子第一电离能大
D．根据原子核外电子排布的特点，Cu在周期表中属于s区元素
答案：B
题目分析：A、在基态多电子原子中，同一能级的p轨道电子能量一定高于s轨道电子能量，A不正确；B、根据核外电子排布规律可知，B正确；C、氮元素的2p轨道电子处于半充满状态，稳定性强，所以氮元素的第一电离能大于氧元素的第一电离能，C不正确；D、Cu在周期表中属于ds区元素，D不正确，答案选B。
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