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　Mercury

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介绍 : It is dissolved in nitric acid and hot concentrated sulfuric acid to form mercury nitrate and mercury sulfate, respectively, and mercurous salts appear in excess of mercury. It dissolves many metals and forms alloys called amalgams. The valence is +1 and +2. Similar to silver, mercury can also react with hydrogen sulfide in the air. Mercury has a constant coefficient of volume expansion, its metal activity is lower than zinc and cadmium, and it cannot replace hydrogen from acid solutions. The general valence of mercury compounds is +1 or +2, +4 mercury compounds only mercury tetrafluoride, and +3 mercury compounds do not exist.
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