What Makes Up the Earth Atmosphere?

The atmosphere of the planet Earth or Tarra as it is known to science is composed of a long list of gasses. I am listing the gasses according to the amount of that gas in the atmosphere with the largest contributor first. Nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, krypton, hydrogen, nitrous oxide, xenon, ozone, nitrogen dioxide, iodine, carbon monoxide, ammonia and water vapor are the components of the Terran atmosphere.