Phosphorus is a multivalent nonmetal element (atomic number 15) that plays a central role in chemistry, biochemistry, and environmental science as a core component of phosphate (PO₄³⁻) groups. In molecular systems, it forms P–O, P–N, and P–C bonds and underlies the structure and energetics of nucleotides, nucleic acids, and phosphorylated metabolites via high-energy phosphoanhydride and phosphoester linkages. In materials and catalysis research, phosphorus appears in organophosphorus compounds, phosphines, and metal phosphides, influencing electronic structure, coordination behavior, and reactivity. In geochemistry and ecology, phosphorus cycling governs primary productivity and nutrient limitation in terrestrial and aquatic ecosystems.
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