目前教具厂生产的立体分子结构模型有两种。一种是所谓“球——棍模型”,这种模型是用各种颜色的小球来表示不同元素的原子,短棍表示各原子间的键,由此模型可以清楚地看出分子的几何对称性;另一种是斯土阿尔特(Stuart)模型,它是按照原子半径和键长的比例来制做的,可以更精确的表示分子中各原子间的立体关系。但是,这两种模型多为固定式而不能变化,也不能用以说明共价键的性质和分子的形成过程,难于满足教学需要。 Currently there are two stereoscopic molecular structure models produced by the teaching aids factory. One is the so-called “ball-stick model”. In this model, atoms of different elements are represented by small balls of various colors. A short stick represents the bond between atoms. The model can clearly see that the geometry of the molecule Symmetry; the other is Stuart model, which is made according to the ratio of atomic radius and bond length, which can more accurately represent the three-dimensional relationship between atoms in a molecule. However, these two models are mostly fixed and can not be changed, nor can they be used to illustrate the nature of covalent bonds and the formation of molecules, difficult to meet the teaching needs.