Chemistry
What symbol appears on the periodic table for Thorium which has the atomic number 90?
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Felix Hoffmann, not Bayer, first patented what remedy?
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What element was discovered as a component of the debris of the first hydrogen bomb explosion?
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Gold, silver, lead, and copper exhibit the properties of which of the following crystal systems?
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Phosphorus is the 13th element to be discovered, where did it come from?
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Which of the following common laboratory chemicals does a person not normally consume?
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What is a chemical process by which the hair is permanently straightened?
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