《氮和璘》是非金属元素知识教学的继续。通过本章的教学,可使学生对非金属元素及其化合物的知识掌握得更加牢固、完整,并进一步了解它们之间的内在联系和相互关系(如非金属元素跟氢、氧、金属等之反应)。本章教材的内容比较丰富,除包括氮和磷两元素和它们的化合物的知识外,还包括了化学平衡理 “Nitrogen and helium” is the continuation of the teaching of nonmetallic elements knowledge. Through the teaching of this chapter, students can gain a firmer and more complete knowledge of non-metallic elements and their compounds, and further understand the intrinsic relations and interrelationships between them (such as the reaction of non-metallic elements with hydrogen, oxygen, metals, etc.). ). The content of this chapter’s teaching materials is rich. In addition to the knowledge of the two elements of nitrogen and phosphorus and their compounds, it also includes chemical balance theory.