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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.
Similarly 13th group is Boron family, the 14th is carbon family, 15th is nitrogen family, 16th is oxygen family and 17th is commonly known as halogen family. These groups are known with their 1st element of the group.