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Never found free in nature, phosphorus is widely available in combination with minerals and is an important component of many organic compounds of many organic compounds. Available in three allotropic forms; red, black, and white, ordinary phosphorus is a waxy white solid that is colorless and transparent when pure. It is insoluble in water and highly reactive in air. When exposed to sunlight, or when heated in its own vapor, white phosphorus converts to the red variety, which is relatively stable. The black form resembles graphite and is stable in air.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(15P30-973762)||Heat of Vaporization||2.97k-cal/g-atom|
|CAS #||7723-4-0||Atomic Volume||17.0W/D|
|First Ionization Energy||254K-cal/g-mole|
|Melting Point (red)||416°C(sublimes)||Electronegativity||2.1Pauling's|
|Density (red)||2.34g/cm3||Covalent Radius||1.06Angstroms|
|Specific Heat @ 25°C||0.177cal/g°C||Mohs Hardness @ 20°C||0.5|
|Heat of Fusion||0.15k-cal/g-atom||Crystal Structure||Cubic|