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By molar amount, hydrogen and oxygen are the most common elements; carbon is the third.

By mass, oxygen is the most common, and carbon is the second (with hydrogen being third by mass).

By mass, oxygen is the most abundant, and phosphorus is the least, carbon the 2nd, hydrogen, 3rd.

By atoms, hydrogen is most abundant, and phosphorus the least, oxygen 2nd, carbon 3rd.

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14y ago

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