Venus' atmosphere is almost entirely (96.5%) carbon dioxide and a bit of (3.5%) nitrogen. There are trace amounts of sulfur dioxide, argon, water vapor, carbon monoxide, helium, and neon as well. You can find more information here: http://www.daviddarling.info/encyclopedi...
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Venus contains 96.5% carbon dioxide and 3.5% nitrogen. There are also small traces of sulfur dioxide, argon, water vapor, carbon monoxide, helium, and neon.