The periodic table can be simply demarcated into four classes of metal and four classes of nonmetal. Such a treatment has been obstructed by the traditional view of metalloids as in-between elements; understandable but needless boundary squabbles; and a group-by-group view of the reactive nonmetals. Setting aside these limiting notions reveals some interesting patterns and facilitates teaching and learning the periodic table.

中文翻译：

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组织金属和非金属

元素周期表可以简单地划分为四类金属和四类非金属。传统观点认为准金属是介于两者之间的元素，这阻碍了这种处理方式。可以理解但不必要的边界争吵；以及反应性非金属的逐组视图。抛开这些限制性概念，揭示了一些有趣的模式，并促进了元素周期表的教学和学习。