Chemistry
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Chemistry Help ASAP A gas whose molecule is monatomic is 1) oxygen; 2) helium; 3) nitrogen; 4) chlorine; 5) hydrogen.

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MyraCochran

The answer here is helium. You can remember the diatomic elements with this mnemonic: HOFBrINCl (hydrogen, oxygen, fluorine, bromine, iodine, nitrogen, and chlorine).

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