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Atomic Structure & Chemical Bonding - Harvard University
projects.iq.harvard.eduChapter 1 Atomic Structure & Chemical Bonding 4 biological matter, about 99%, is made of just six elements: carbon, hydrogen, nitrogen, oxygen, sulfur, and phosphorus. Most biological molecules, such as proteins, carbohydrates, lipids, and nucleic acids, are exclusively composed of these elements. A few other atoms also play roles in biology;