一、教材特点碱金属是典型的金属元素 ,是学生学习的第一个金属元素族。初中已学了铁等金属 ,以及碳酸钠、氯化钠、氢氧化钠等钠的化合物的知识 ,这为进一步学习碱金属打下了基础 ,同时碱金属的知识较其他元素族相对简单。因此新教材将其编排在第二章学习 ,一方面可巩固第一章? First, the characteristics of teaching materials Alkali metal is a typical metal element, is the first metal element family students learn. Junior high school has learned about iron and other metals, as well as sodium carbonate, sodium chloride, sodium hydroxide and other sodium compounds knowledge, which laid the foundation for further study of alkali metals, while the knowledge of alkali metals is relatively simple compared to other elements of the family. Therefore, the new textbook will be arranged in the second chapter. On the one hand, it will consolidate the first chapter.