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Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% by mass of nitrogen, the fourth most abundant element in the body after oxygen, carbon, and hydrogen.
By Anne Marie Helmenstine, Ph.D. The nitrogen family is element group 15 of the periodic table. Here are some facts about the nitrogen family: 1  The nitrogen family consists of nitrogen, phosphorus, arsenic, antimony and bismuth. 2  Nitrogen family elements consists of atoms having 5 electrons in their outer energy level.