Symbol P Atomic radius: pm 110 Fusion: kJ/Mole 0.66
Name Phosphorus Ionic radius: pm (+5)17 Boiling point: C 280
Atomic number 15 Electron affinity 0.75 Melting point: C 44
Atomic weight 30.97 1st  ion potential 10.36 Specific Heat Cap: J/(g K) 0.77
Classification Non-metal Natural form Solid Thermal Cond: W/(cm K) 0.002
Configuration [Ne]3s2p3 Crystal structure Cubic Electrical Cond 1x10-17
Oxidation states +/-3,5,4 Density 1.82 Abundance: mg/kg-crust 1,050
Electronegativity 2.19 Vaporization: kJ/Mole 12.40    
Phosphorus was first prepared in elemental form in 1669 by a German alchemist, Hennig Brand, from a residue of evaporated urine.      Uses - fertilizer, detergents, matches, fireworks, pesticides