- Atomic Radius (Å)
Phosphorus is a chemical element with symbol P and atomic number 15. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but due to its high reactivity, phosphorus is never found as a free element on Earth. Instead phosphorus-containing minerals are almost always present in their maximally oxidised state, as inorganic phosphate rocks.
15
Atomic Number
30.97
Atomic Mass (u)
317.25
Melting Point (K)
553
Boiling Point (K)
1.82
Density (solid: g/cm³, gas: g/liter)
1.2
Atomic Radius (Å)
1.07
Covalent Radius (Å)
2.19
Electronegativity
10.49
First Ionization Energy (eV)
72.04
Electron Affinity
3
Number of Shells
5
Electron Valency
2, 8, 5
Electron Shell Occupations
0.77
Specific Heat (J/g)