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Mercury atmospheric composition:
Oxygen 42%Sodium 29%Hydrogen 22%Helium 6%Potassium 0.5%With trace amounts of the following:
Argon, Carbon dioxide, Water, Nitrogen, Xenon, Krypton, Neon, Calcium, Magnesium
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Mercury's atmosphere contains small amounts of hydrogen(22%), helium(6%), and oxygen(42%). It also has sodium, potassium, calcium, and magnesium in little amounts.
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