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Explanation:
The only chemical elements that are stable single atom molecules at standard temperature and pressure (STP) are the noble gases. These are helium, neon, argon, krypton, xenon, and radon.
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Answer:
Hᴇʟɪᴜᴍ
Explanation:
Helium is considered monoatomic because it has 1 atom in its molecule, but hydrogen is considered diatomic because it has 2 atoms of hydrogen in its molecule
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