物质的分子式是根据各元素的正负化合价,按分子内各正负化合价的代数和为零的原则书写的,根据这个原则,我们可以自制一套教具,像拼积木一样,将物质的分子式拼积出来。制作积木式分子式所需材料容易收集和加工,如聚苯乙烯泡沫塑料,可以从仪表包装材 The formula of the substance is written according to the positive and negative valences of each element, according to the principle of the algebraic sum of zeros and valences of the positive and negative valences in the molecule. According to this principle, we can make a set of teaching aids, like the building block, and the molecular formula of the substance. Accumulate. The materials needed to make modular blocks are easy to collect and process, such as polystyrene foam, which can be packaged from instrumentation.