Chemistry

Which of these objects has the most mass?

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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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What is the name for naturally-occurring alloy of gold and silver with a small amount of other metals?
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What is the final product of the Uranium 238 decay chain?
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What kind of gas is CO2?
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What is the second most abundant element by mass (about 18.5%) in the human body?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What heat is released during a change of state?
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Which is not considered a fossil fuel?
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