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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 an essential macro-element, required for plant nutrition. It participates in metabolic processes such as photosynthesis, energy transfer and synthesis and breakdown of carbohydrates. Phosphorus is found in the soil in organic compounds and in minerals.hosphorus is an essential macro-element, required for plant nutrition. It participates in metabolic processes such as photosynthesis, energy transfer and synthesis and breakdown of carbohydrates. Phosphorus is found in the soil in organic compounds and in minerals.