Chemistry
Clocks made out of what alkali metal are considered the most accurate of all clocks?
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What is the symbol used on the periodic table for the element Lawrencium?
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What is the symbol used on the periodic table for the element Americium?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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What is the molecular geometry of the molecule sulfur hexafluoride?
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The red color of rubies is caused mainly by the presence of what element?
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