一、复习要点1．ⅠA和ⅡA族元素——典型的金属①以钠、镁为例,了解典型金属的物理性质和化学性质。②从原子的核外电子排布人手,理解ⅠA、ⅡA族元素(单质、化合物)的相似性和递变性。③掌握最重要的两种碱性化合物(NaOH和Na_2CO_3)的性质和用途。④了解硬水及其软化。2．其它常见的金属(如:Fe、Al、Zn、Cu)①了解Fe和Al的天然资源、冶炼原理、性质和用 First, review points 1. Elements IA and IIA - Typical Metals 1 Take sodium and magnesium as examples to understand the physical and chemical properties of typical metals. 2 From the outer nuclear electronic arrangement of atoms, understand the similarities and transitions of IA and IIA elements (elements and compounds). 3 Master the properties and uses of the two most important basic compounds (NaOH and Na_2CO_3). 4 Learn about hard water and its softening. 2. Other common metals (eg, Fe, Al, Zn, Cu) 1 Understand the natural resources of Fe and Al, the smelting principle, properties, and applications