Chemistry

What is the second most abundant element by mass (about 18.5%) in the human body?

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What is the chemical term for a peptide; two amino acids linked together?
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What does "ATP" stand for in chemistry?
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Which atomic particle is outside the nucleus?
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Which of these is an odorless and colorless gas?
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What chemical substance is abbreviated CO2?
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Which metal contains 60% copper and 40% zinc?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the symbol used on the periodic table for the element Promethium?
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