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Which of the following is a noble gas? carbon dioxide, boron, oxygen, and helium

User Sunseeker
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Carbon dioxide is a noble gas.
User Jrook
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helium is a nobel gas  carbon dioxide is a compound boron I think is a metal oxgen is not a nobel gas    I know the periodic table of elements like its the back of my hand I'm only14
User Frederic Adda
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