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根据教学大纲和考试大纲的要求,金属元素单质及化合物我们需掌握Na、Mg、Fe、Al单质及常见化合物的性质,了解金属冶炼的一般原理及金属的回收和资源保护。因此,对本部分的复习,我们需从以下几个方面把握。一、知识要点 1.金属元素在周期表中的位置及原子结构金属元素位于周期表B—At线左下方,在目前发现的元素中,金属元素约占4/5,包括ⅠA(除H外)、ⅡA全部,ⅢA—ⅣA的部分元素及全部过渡元素。金属原子最外层电子数一般不超过4个,通常易失去电子而表现还原性,主族元素的价
According to the teaching syllabus and the outline of the examinations, we need to understand the properties of simple and precise metal elements and compounds, understand the general principles of metal smelting and metal recovery and resource protection. Therefore, the review of this section, we need to grasp the following aspects. First, the knowledge points 1. Metal elements in the periodic table and the atomic structure of the metal elements located in the lower left B-At line in the table, found in the elements, the metal elements account for about 4/5, including Ⅰ A (except H ), Ⅱ A all, Ⅲ A-Ⅳ A part of the elements and all the transition elements. Metal atoms in the outermost number of electrons generally not more than 4, usually easy to lose the electronic performance of the reduction of the main elements of the price