uranous造句

• Uranium in its tetravalent ( uranous ) state is very important in different technological processes.
• Uranous compounds are usually unstable; they revert to the oxidised form on exposure to air.
• "' Uranous "'is the chemical term for the oxidised hexapositive ion called uranyl.
• Minerals containing the uranous ion are more subdued in colour, typically brown or black, and occur in reducing environments.
• Common uranous minerals include : uraninite; pitchblende ( a crystalline variant of uraninite ); and coffinite " ( Smith, Hutchinson and Blackwell, 1984 )"