Chemistry
What symbol appears on the periodic table for the element with the atomic number 18?
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What word means "two or more types of matter are evenly distributed in a mixture"?
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Clocks made out of what alkali metal are considered the most accurate of all clocks?
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The noble gases that make up Group XVIII of the periodic table is also known as which of the following?
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What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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What phenomenon explains why cyclohexatriene does not exist?
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