21.下表是元素�期表的一部分回答下列问题 1写出��两种元素形成的化合物有两种化学式 2写出�元素最高价氧化物的 Template




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tomski21.下表是元素�期表的一部分回答下列问题 1写出��两种元素形成的化合物有两种化学式 2写出�元素最高价氧化物的 coloring