問題：It is one of the period 4 elements.<br />The oxidation number of the metal is three and six. The six one is dangerous for the environment.<br /> 出題元【Elements 2】

出題元【Elements 2】

問題

It is one of the period 4 elements.<br />The oxidation number of the metal is three and six. The six one is dangerous for the environment.<br />

Ｑ：It is one of the period 4 elements.<br />The oxidation number of the metal is three and six. The six one is dangerous for the environment.<br />

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