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2020-06-23View Original

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选择题：某元素基态价层电子结构为4d15S2,它在周期表中的位置为：（）（A）第四周期，VB ；（B）第五周期，IVB ；（C）第四周期，IIIB；（D）第五周期，IIIB 答案：D 提示：能阐述出解题过程的给予额外奖励，答案回复可见

Reply #22020-06-23

D.根据核外电子排i布规律，该元素基态原子的电子排布式为1s22s22p63s23p63d104s24p64d15s2．由此可见：该元素原子**有39个电子，有5个电子层，最外层上有2个电子，由基态原子的核外电子排布可知该元素位于周期表第五周期第ⅢB族

Reply #32020-06-23

D 解析： D．外围电子排布为4d15s2，为Y元素，位于第5周期第ⅢB族，故D正确；

Reply #42020-06-23

（D）第五周期，IIIB

Reply #52020-06-23

（D）第五周期，IIIB

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