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1 Nitrogen family elements often form covalent compounds, usually with the oxidation numbers +3 or +5. 2  Nitrogen and phosphorus are nonmetals. 3  Arsenic and antimony are metalloids. 4  Bismuth is a metal.
Phosphorus is found in the nucleus of every cell. Phosphorus is part of nucleic acids, energy compounds, and phosphate buffers. The element is incorporated into the bones, combines with other elements including iron, potassium, sodium, magnesium and calcium.