Chemistry

What is the first element on the periodic table?

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What kind of gas is CO2?
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Approximately how many chemicals are in a cup of coffee?
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What is known as the energy required to start a chemical reaction?
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What is used in manufacturing matches, fertilizers and pesticides, and in vulcanization of rubber?
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Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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What gas makes up most of the atmosphere of Mars?
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What symbol appears on the periodic table for the element with the atomic number 88?
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Which of these objects has the most mass?
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