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氫氧根OH- 硝酸根NO3- 銨根NH4+ 硫酸根SO42- 碳酸根CO32-
根據化合價記憶 有氧顯正價,無氧顯負價 OH氫+1氧-2 硫酸根SO4硫+6 硝酸根NO3氮+5 碳酸根CO3碳+4 銨根NH4氮-3(國中唯一正價原子團)
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