<P> The order of elements by volume - fraction ( which is approximately molecular mole - fraction ) in the atmosphere is nitrogen ( 78.1 % ) , oxygen ( 20.9 % ) , argon ( 0.96 % ) , followed by ( in uncertain order ) carbon and hydrogen because water vapor and carbon dioxide , which represent most of these two elements in the air , are variable components . Sulfur , phosphorus , and all other elements are present in significantly lower proportions . </P>
<P> The order of elements by volume - fraction ( which is approximately molecular mole - fraction ) in the atmosphere is nitrogen ( 78.1 % ) , oxygen ( 20.9 % ) , argon ( 0.96 % ) , followed by ( in uncertain order ) carbon and hydrogen because water vapor and carbon dioxide , which represent most of these two elements in the air , are variable components . Sulfur , phosphorus , and all other elements are present in significantly lower proportions . </P>
what is the most common element in our air
what is the most common element in our air
nitrogen
nitrogen