15
P
phosphorus
30.974

General properties

Group
group 15 (pnictogens)
Period
period 3
Category
nonmetals
Standard atomic weight
30.973 761 998(5)
Melting point
317.3 K (white)
Boiling point
553.7 K (white)
Phase at STP
solid

Additional properties

Block
p-block
Electron configuration
[Ne] 3s² 3p³
Electrons per shell
2, 8, 5
Electronegativity
2.19
Density
white: 1.823 g/cm³ red: ≈2.2–2.34 g/cm³ violet: 2.36 g/cm³ black: 2.69 g/cm³
Oxidation states
−3, −2, −1, 0, +1, +2, +3, +4, +5 (a mildly oxide)
CAS Number
7723-14-0