What is the most common element in the Earth's atmosphere?
Abundance of the chemical elements
{'answer_start': array([111]), 'answer_text': array(['nitrogen'], dtype=object)}
The order of elements by volume-fraction (which is approximately molecular mole-fraction) in the atmosphere is nitrogen (78.1%), oxygen (20.9%),[14] 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.