Atomic Element Z = 15 • Reactive Nonmetal
Phosphorus (P) — Atomic Data, Electron Shells & Reactions
Phosphorus (symbol P, atomic number 15) has a standard atomic weight of 30.974 u and ground-state configuration [Ne] 3s2 3p3.
Atomic Number (Z)
15
IUPAC Symbol
P
Standard Atomic Weight
30.974 g/mol
Period / Group / Block
3 / 15 / p-block
Condensed Electron Config
[Ne] 3s2 3p3
Full Subshell Config
1s2 2s2 2p6 3s2 3p3
Principal Shell Occupancy
[2, 8, 5]
Pauling Electronegativity
2.19
First Ionization Energy
1012 kJ/mol
Covalent Radius
107 pm
Melting Point
317.3 K (44.15 °C)
Boiling Point
553.7 K (280.55 °C)
Density
1.823 g/cm³
Oxidation States
+5, +3, -3
P (Z=15) — Valence shell highlighted in vermilion
Interactive Stoichiometry Reactions Involving Phosphorus:
H3PO4 + Ca(OH)2 -> Ca3(PO4)2 + H2O