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Information valid for P-31 unless otherwise noted

Basic Information

Symbol: P
Atomic Number: 15
Mass: 30.97376
Melting Point: 44.1 C
Boiling Point: 280.0 C
Number of Protons/Electrons: 15
Number of Neutrons: 16
Classification: Non-metal
Crystal Structure: Monoclinic
Density @ 293 K: 1.82 g/cm3
Color: white

Atomic Structure

[Bohr Model of Phosphorous]
Number of Energy Levels: 3

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 5


Isotope Half Life
P-31 Stable
P-32 14.28 days
P-33 24.3 days


Date of Discovery: 1669
Discoverer: Hennig Brand
Name Origin: From the Greek words phs (light) and phoros (bearer)
Uses: fertilizers, detergents
Obtained From: phosphate rock