在 19世纪和 2 0世纪上半叶 ,发现新元素及其化合物是化学研究的前沿之一。从 2 0世纪下半叶起 ,化学的主要任务不再是发现新元素 ,而是合成和研究新分子。在这些新分子中 ,有很多是人们感兴趣的明星分子。认识并研究明星分子及其对中学化学教学的作用 ,对认识“化学是在分子层 In the 19th century and the first half of the 20th century, the discovery of new elements and their compounds was one of the frontiers of chemical research. From the second half of the 20th century, the main task of chemistry is no longer to discover new elements but to synthesize and study new molecules. Among these new molecules, there are many star elements that people are interested in. Recognize and study the celebrity molecules and their role in chemistry teaching in middle school. Know that chemistry is at the molecular level