SymbolP
Latin namePhosphorus
Atomic number15
Period3
Element categoryNonmetals
Relative atomic mass30.973762
GroupV.A
Electronegativity
2.1
Oxidation numbers
-3, 3, 5
Electron configuration
1s2 2s2 2p6 3s2 3p3
Density [g/cm3]
1.83
State
Solid
Melting point [°C]
44.1
Boiling point [°C]
280
Atomic radius [pm]
98
Covalent radius [pm]
106
Thermal conductivity [W m-1K-1]
0.235
Heat capacity [J K-1g-1]
0.769
Discovery
1669
Electrical conductivity [S m-1]
1 · 107
1.st ionization energy [eV]
10.4867
2.nd ionization energy [eV]
19.725
3.rd ionization energy [eV]
30.18
Stable isotopes
1
Unstable isotopes
6