Is a chemical element of atomic number 15, a poisonous, combustible nonmetal that exists in two common allotropic forms, white phosphorus, a yellowish waxy solid that ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches.
Physical Properties of Phosphorus
- Has an atomic mass 30.97 amu
- Radius angstroms of 1.23 a
- Density 1.8 g/cm
- Melting point of 44.1°c
- Boiling point of 280°c
Phosphorus was the 13th element to be discovered. It was the first element to be discovered that was not known since ancient times. The discovery of phosphorus is credited to Dr. Henning Brand in 1669, Brand experimented with urin, which contains phosphates from normal metabolism. Brand attempted to create the fabled philosopher's stone, and in the process produced a white material that glowed in the dark and burned brilliantly.
The Phosphorus Challenge
Phosphorus derived from Greek, 'phosphoros' meaning brunger of light.
Brand called it 'cold fire' because it was glowing in the dark.