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The most common element in the atmosphere is Nitrogen (N), which is taken in by plants and animals, but is not of any use in cellular respiration, so it is exhaled straight back out during breathing. The second most common element in the air is Oxygen (in the compound, O2), which is needed by the body to carry within the blood to provide oxidation that keeps us alive and powers muscles such as the heart which pumps the blood.

The atmosphere is made up of 78% Nitrogen 21%, Oxygen, and 2% other gases such as carbon-dioxide (a compound, CO2), water vapor (H2O), and other gasses -- including the "noble" gasses such as Helium (He), Argon (Ar), Neon (Ne), and so on.

There are small amounts of gasses such as Chlorine (Cl2) and Flourine (F2), but Bromine (Br) is a liquid and not a gas at room temperature.

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Q: What is the second most common element in the air?
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