一、写错元素符号错例氯化镁（mgcl。）、高锰酸钾（kMNO4）等。分析产生上述错误的原因主要是同学们对元素符号的书写原则不熟悉。正确书写元素符号是写好化学式的基础，必须严格按原则书写：元素符号是采用它的拉丁文名称的第一个大写字母来表示的，所以钾应写成K而不是k；当 First, the wrong element symbol wrong example of magnesium chloride (mgcl.), potassium permanganate (kMNO4) and so on. The reason for the above errors in the analysis is that the students are not familiar with the principle of writing elements. The correct writing of the element symbol is the basis for writing the chemical formula. It must be written strictly in accordance with the principle: The element symbol is represented by the first capital letter of its Latin name, so potassium should be written as K instead of k;