PHOSPHOROUS


Atomic Number: 15
Mass Number: 30.97376
Electron Configuration: 1s22s22p63s23p3
Melting Point: 44.1 C (white phosphorous)
First Ionization Energy: 1012 kJ/mol
Electronegativity: 2.2
Atomic Radius: 110 pm

Above 31oC, white phosphorous spontaneously ignites in air.