Chemistry
What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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What major chemical other than chlorine is used to purify water of microorganisms?
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What element was known in ancient times and referred to in Genesis as "brimstone"?
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What symbol appears on the periodic table for the element with the atomic number 88?
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Gold, silver, lead, and copper exhibit the properties of which of the following crystal systems?
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