Chemistry
What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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What isotope of carbon can be used to figure out how old some objects are or when something died?
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What symbol appears on the periodic table for the element with the atomic number 22?
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From all salt elements, which group is most soluble?
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What is the symbol used on the periodic table for the element Francium?
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Because they are so reactive with air and water, what group of elements are generally stored in oil?
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