15
P
30.974
Phosphorus (P)
Element 15 · Period 3 · Group 15
nonmetal
solid at room temp
p-block
About Phosphorus
Essential for DNA, RNA, and ATP. Used in fertilizers and matches.
Physical Properties
Atomic Mass
30.974 u
State at 25°C
Solid
Melting Point
44.15 °C
Boiling Point
280.5 °C
Density
1.823 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Ne] 3s² 3p³
Electron Shells
2, 8, 5
Electronegativity
2.19
Atomic Radius
98 pm
Ionization Energy
1012 kJ/mol
Oxidation States
-3 to +5
Discovery & History
Discovered By
Hennig Brand
Discovery Year
1669
Named By
Hennig Brand
Name origin: Greek: phosphoros (light-bearer)
Frequently Asked Questions
- Is Phosphorus a metal, nonmetal, or metalloid?
- Phosphorus is classified as a nonmetal.
- What state is Phosphorus in at room temperature?
- Phosphorus is a solid at standard room temperature (25°C).
- What is the atomic mass of Phosphorus?
- Phosphorus has an atomic mass of 30.974 atomic mass units (u).
- Who discovered Phosphorus?
- Phosphorus was discovered by Hennig Brand in 1669.
- Where is Phosphorus on the periodic table?
- Phosphorus is element number 15, located in period 3 and group 15.