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（13分）下图是元素周期表的一部分，其中所列字母分别代表某一元素 a b j c d e f g h i k （1）写出元素k基态原子的核外电子排布式________________________。 （2）e、f单质及ef形成的合金的硬度由大到小的顺序为_______________________（用具体名称回答） （3）用来组成酸、碱、盐三类物质至少需要的元素有___________________（用表中列出元素的化学式填写） （4）短周期某主族元素M的电离能情况如图（A）所示。则M元素位于周期表的第 族。 图B是研究部分元素的氢化物的沸点变化规律的图像，折线c可以表达出第 族元素氢化物的沸点的变化规律。不同同学对某主族元素氢化物的沸点的变化趋势画出了两条折线：折线a和折线b，你认为正确的是 。
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