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元素符号和化学式是最基础的化学用语，它们都具有多种含义，正像汉语中的多义词一样，能够在不同的语境中表达出不同的含义。在新编九年义务教育初中化学教材中涉及到的含义有两种：一是宏观含义——元素符号表示一种元素；化学式表示一种物质或物质的组成。二是微观含义——
Elemental symbols and chemical formulas are the most basic chemical terms. They all have many meanings. Just like polysemy words in Chinese, they can express different meanings in different contexts. There are two implications involved in the new nine-year compulsory education junior high school chemistry textbooks: First, the macro meaning - the element symbol represents an element; the chemical formula represents the composition of a substance or substance. The second is the microscopic meaning -