Chemistry

Which of the following is not a heavy metal?

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What chemical substance is abbreviated CO2?
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What transition metal's symbol comes from the Latin word "hydrargyrum" meaning "liquid silver"?
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What are vast amounts of oil that have become trapped in one place called?
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How do acids normally taste?
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What is the symbol used on the periodic table for the element Protactinium?
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What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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Which of these is an element?
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Mendelevium on the periodic table is noted by which symbol?
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