Why are element carbon, hydrogen, oxygen and nitrogen called structura

1.	Why are element carbon, hydrogen, oxygen and nitrogen called structural elements
Answer» Carbon has an exceptional ability to bind with a wide variety of other elements. Carbon atoms can form multiple stable bonds with other small atoms, including hydrogen, oxygen, and nitrogen. Carbon atoms can also form stable bonds with other carbon atoms. In fact, a carbon atom may form single, double, or even triple bonds with other carbon atoms. This allows carbon atoms to form a tremendous variety of very large and complex molecules.

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