Chemical elements such as oxygen and sodium in Chinese make use of the traditional method of forming a character by which both pronunciation and form are grouped together. If both the pronunciation and meaning of a word can be combined into one, then that's all the better.
此外，像氧、鈉等化學元素，就是利用漢文傳統形聲字的創字法，配合形符和聲符翻譯外國語的詞彙。