This is a schematic showing how atmospheres form.
Click on image for full size
Image from: The New Solar System
How a planet-to-be sweeps up nearby material to be part of itself
As shown in this picture, while they were forming in the solar nebula, the core of the planets-to-be drew material to themselves from the cloud of gas and dust around them. The bigger planets-to-be were able to draw even more material unto themselves because of gravity.
Because of its position in the solar nebula, Saturn was able to draw a huge amount of gas unto itself.
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