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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.
The elements nitrogen, phosphorus, arsenic, antimony and bismuth are referred to as the nitrogen family of element and occupy group V-A in the periodic table. The nitrogen family periodic table is shown below. Nitrogen and phosphorus are non metals, arsenic is a semi metal or non metal, antimony and bismuth are metals.