氧元素与另一元素组成的化合物，一般要把氧元素符号写在右边；氢元素与另一元素组成的化合物，一般要把氢元素符号写在左边；金属元素、氢元素与非金属元素组成的化合物，一般要把非金属元素符号写在右边。直接由离子构成的化合物，其化学式常用其离子�

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