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由核外電子决定.元素的核外電子相互化合的數目,就决定了這種元素的化合價,化合價就是為了方便表示原子相互化合的數目而設定的.學習化合價時你應該瞭解化合物中元素化合價的規定.
5SO2+2(MnO4-)+2H2O=5(SO42-)+2(Mn2+)+4(H+)
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