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