15 P Phosphorus 30.974 u

Phosphorus

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Period
3
Group
15
Block
p-block
Phase (STP)
Solid

Phosphorus is essential for life, found in DNA, RNA, and ATP. It exists in several allotropic forms including white and red phosphorus.

Appearance: Waxy white (white phosphorus)

Physical Properties

Atomic Mass 30.974 u
Density 1.82 g/cm³
Melting Point 44.2 °C
Boiling Point 280.6 °C
Phase at STP Solid
Atomic Radius 98.0 pm

Electronic Properties

Electronegativity 2.19
Ionization Energy 1011.8 eV
Electron Affinity 72.0 eV
Valence Electrons 5

Electron Configuration

Configuration [Ne] 3s² 3p³

Electron Shell Configuration

Phosphorus electron shell configuration P 2e⁻ 8e⁻ 5e⁻

Position in Periodic Table

Phosphorus position in the periodic table P

Discovery

Discovered by: Hennig Brand
Year: 1669

Compounds Containing Phosphorus

More Nonmetal

Frequently Asked Questions

What is Phosphorus?
Phosphorus (P) is a chemical element with atomic number 15. It is a solid at standard temperature and pressure, classified as a nonmetal.
What are the key properties of Phosphorus?
Phosphorus has an atomic mass of 30.974 u, density of 1.82 g/cm³, melting point of 44.2°C, boiling point of 280.6°C.
What is the electron configuration of Phosphorus?
The electron configuration of Phosphorus is [Ne] 3s2 3p3. It is in the p-block of the periodic table.
Who discovered Phosphorus?
Phosphorus was discovered by Hennig Brand in 1669.
What is the electronegativity of Phosphorus?
Phosphorus has an electronegativity of 2.19 on the Pauling scale.