whether it will move down due to gravity or move up because its most light gas and further there is no other molecules of air because it is in vacuum. this may not be practically done but what theory says.
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i still have a question that; why does the atom wouldn't fall down due to gravity? isn't gravity able to effect such small thing or atom has something greater than gravity?
If it was cooled to absolute zero, probably, but otherwise it has too much energy. It's the same reason that our atmosphere doesn't collapse or float away. There is enough energy in the gases to balance with gravity.
thanks a lot