Rigel 
Phosphorus is the second element in the fifteenth column of the period table. It is classified as a nonmetal. Phosphorus atoms have 15 electrons and 15 protons with 5 valence electrons in the outer shell.
The element phosphorus
Symbol: P
Atomic Number: 15
Atomic Weight: 30.97376
Classification: Nonmetal
Phase at Room Temperature: Solid
Density: white: 1.823 grams per cm cubed
Melting Point: white: 44.1°C, 111°F
Boiling Point: white: 280°C, 536°F
Discovered by: Hennig Brandt in 1669
Characteristics and Properties
Phosphorus is a highly reactive element and, as a result, is never found on Earth as a free element. Elemental phosphorus comes in various allotropes (different crystal structures) including white, red, violet, and black phosphorus. The two major forms of phosphorus are white and red.
White phosphorus is very reactive and unstable. White phosphorus is yellowish in color and is highly flammable. It will spontaneously ignite when it comes into contact with air. White phosphorus glows in the dark and is also very toxic.
Red phosphorus is generally more stable than white. It is also less toxic and doesn’t spontaneously ignite when coming into contact with air. Red phosphorus is made by heating white phosphorus.
About The Author
Doyen Altair 
Aurora