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问题 选择题

下列比较正确的是

A．电负性：K原子>Na原子

B．离子半径：r(Al3＋)>r(O2－)

C．能量：E(4s)>E(3d)

D．第一电离能：I1(P)>I1(S)

答案

答案：D

题目分析：电负性应该为K原子<Na原子，故A错误；铝离子和氧离子具有的电子层数都为2，根据电子层数相同，原子序数小的，半径大的规则，可以知道离子半径：r(Al3＋)<r(O2－)，故B错误；能量应该为E(4s)<E(3d) ，故C错误；第一电离能为I1(P)>I1(S)，因为P为半充满状态，故其电离能相邻的S大，所以D为本题的答案。

点评：本题考查了元素周期表的相关知识，属于对基础知识的考查，本题难度不大。

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