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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 located in group 15 of the periodic table and has an atomic number equal to 15. This means that a neutral phosphorus atom has a total of 15 electrons. The ground state electron configuration for phosphorus is. P:1s22s22p63s23p3.