Friday 3 August 2007 7 most abundant elements/compounds in the atmosphere

  1. Nitrogen (N2) 78.084%
  2. Oxygen (O2) 20.9476%
  3. Argon (Ar) 0.934%
  4. Carbon Dioxide (CO2) 0.0314%
  5. Neon (Ne) 0.001818%
  6. Helium (He) 0.000524%
  7. Methane (CH4) 0.0002%

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