What chemical elements and their compounds were in the primary atmosphere of the Earth?

As soon as the Earth cooled down, an atmosphere formed around it, from the released gases. Unfortunately, it is not possible to determine the exact percentage of the elements of the chemical composition of the primary atmosphere, but it can be assumed with accuracy that the gases included in its composition were similar to those that are now emitted by volcanoes – carbon dioxide, water vapor and nitrogen. Volcanic gases in the form of superheated water vapor, carbon dioxide, nitrogen, hydrogen, ammonia, acid fumes, noble gases and oxygen formed the near-atmosphere. At this time, oxygen did not accumulate in the atmosphere, since it was spent on the oxidation of acidic fumes (HCl, SiO2, H2S).

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