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What it most of the gases in yhe air?

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The air around us consists of

      Nitrogen (Around 80%)
      Oxygen is the second most common. (Around 20%)
Other gases present are much rarer
      Argon (Around 1%)
      Carbon Dioxide (Around 0.03%)

Also present at even lower levels are

      Neon
      Helium
      Methane
      Krypton
      Hydrogen
      Xenon
These last few are very rare, from about 1 atom in every 50,000 molecules of air for Neon to around 85 to 90 in 1,000,000,000 for Xenon.

PS - I realise the figures add up to more than 100% but the figures are variable and so cannot be exact. PPS - It is also worth noting that these are the figures for the present time, the levels have fluctuated wildly when considered on a geological time scale.

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