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< Back Phosphorous  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 15 Atomic Symbol P Atomic Weight 30.97362 amu Group Non-Metal, 15 Form Solid Density @ STP 1.823 g/cm3 Melting Point 44.15 °C (111.47 °F, 317.3 °K) Boiling Point 280.5 °C (536.9 °F, 553.7 °K) Heat of Fusion 0.66 kJ/mol Heat of Vaporization 12.4 kJ/mol First Ionization Potential 10.48669 eV Electronegativity (on Pauling scale) 2.19 Specific Heat Capacity 0.769 J/g K Ground State Electron Configuration 3p3 Oxidation States +3, +5, -3 Stable Isotopes and Natural Abundance on Earth 31P, 100% Selected Radioisotopes 32P, 33P Atomic Radius 98 pm Crystal Structure Triclinic Discovered by Brand, 1665

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