铯与氟——元素金属性与非金属性之最

Caesium and Fluorine: the Most Metallic and Nonmetallic Elements

对有关金属性的几个标度进行简要分析,介绍一种适用性更广的电负性标度;辨析电子亲和能和电负性的概念,从而明确学生对金属性和非金属性之最元素的认知。同时对高中人教版必修1中元素周期律和碱金属的教学提出建议。

Several scales of metallicity are briefly analyzed, and a more applicable electronegativity scale is introduced;the concepts of electron affinity energy and electronegativity are analyzed to clarify students’ cognition of the most metallic and nonmetallic elements. At the same time, the teaching methods of element periodic law and alkali metals in compulsory 1 of PEP are proposed.