化學式者,表原子、化合物之式也,以化學符號、號碼、或括號、破折號、大括號、正(+)、負(-)表之。
離子式者,當於右上書其荷。
硫酸根者,書SO42−,銨根者,書NH4+。
欲書核素者,當於左上書其原子量。
以磷三十二所構之磷酸根者,記32PO43−。
欲書官品,可以分子式、結構式書之。
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