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图片：271424_q.jpg
答案：D 心得： （1）解析：A：周期表是按质子数逐渐增大的顺序从左到右排列的 B：He元素及过渡元素中最外层电子数是2的元素不属于ⅡA族 C：副族及零族的最外层电子数就不相同 （2）举一反三：本题主要考的是对于元素周期表的掌握。只要知道了元素周期表的编排原则就能很好的解题。如果以后再遇到此类题，先在心中或者草稿本上简单画出元素周期表中我们学过的较为重要的族和周期（三个短周期和主族、零族），然后通过对比用排除法解题即可 狠话：如若以后再遇此题，若再次错误，就三天不吃饭，一个月不出去玩！！！ |
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沙发#
发布于：2014-05-25 20:30
为什么图片显示不出来？
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板凳#
发布于：2014-05-25 22:59
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