- Nitrogen (N2) 78.084%
- Oxygen (O2) 20.9476%
- Argon (Ar) 0.934%
- Carbon Dioxide (CO2) 0.0314%
- Neon (Ne) 0.001818%
- Helium (He) 0.000524%
- Methane (CH4) 0.0002%
Friday, 3 August 2007 7 most abundant elements/compounds in the atmosphere
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