The phenomenon where two or more compounds have the same molecular formula but different arrangements of atoms. Isomers can have 1 different physical and chemical properties.

两种或多种化合物具有相同的分子式但原子排列不同的现象。异构体可以具有不同的物理和化学性质。(liǎng zhǒng huò duō zhǒng huà hé wù jù yǒu xiāng tóng de fēn zǐ shì dàn yuán zǐ pái liè bù tóng de xiàn xiàng. yì gòu tǐ kě yǐ jù yǒu bù tóng de wù lǐ hé huà xué xìng zhì.)