The atmosphere does not have helium and hydrogen because the two gases are too light to be there. Instead they are in the exosphere, above the atmosphere.
Hydrogen or Helium
Exosphere
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helium
1%
Hydrogen or Helium
Hydrogen and helium
Exosphere
it is mainly hydrogen and helium.
Neptune's atmosphere is made up of hydrogen, helium, and methane.
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hydrogen and helium.
helium and molecular hydrogen
hydrogen and helium
Mostly hydrogen and helium.
Its atmosphere is mostly made of hydrogen and helium with a little methane hydrogen and helium.
helium