Chemistry

What was the fifth unearthly element from the days of Aristotle?

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What are the main two elements that undergo fusion to power the sun?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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Who is considered the "father" of organic chemistry?
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Which of the following carries a negative charge?
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What is the main active chemical in marijuana?
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What phenomenon explains why cyclohexatriene does not exist?
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What symbol appears on the periodic table for the element with the atomic number 88?
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What is the pH of a .1 M solution of HCl?
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