| Formula / Notation | P4 |
|---|---|
| CAS Number | 7723-14-0 |
| Molecular Weight | 30.97 |
| Melting Point | 44.1 |
| Boiling Point | 280.5 |
| Density | 1.82 |
| Solubility | White P: insoluble in water, soluble in CS2 |
| Appearance | White: waxy colourless-yellow solid; Red: red-violet powder |
| Also Known As | P, white phosphorus, red phosphorus |
| Category | Elements |
What is Phosphorus?
Phosphorus is a non-metal, atomic number 15, with several allotropes. White phosphorus (P4) is extremely reactive and toxic; red phosphorus is stable. Essential for life - forms backbone of DNA/RNA and ATP. Critical for agricultural fertilisers.
Formula & Notation
IUPAC Name: Phosphorus
Other Names / Synonyms: P, white phosphorus, red phosphorus
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 44.1 |
| Boiling Point | 280.5 |
| Density | 1.82 |
| Molecular Weight | 30.97 |
| Solubility | White P: insoluble in water, soluble in CS2 |
| Appearance | White: waxy colourless-yellow solid; Red: red-violet powder |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Phosphorus is a non-metal, atomic number 15, with several allotropes. White phosphorus (P4) is extremely reactive and toxic; red phosphorus is stable. Essential for life - forms backbone of DNA/RNA and ATP. Critical for agricultural fertilisers.
Fertilisers (superphosphates - most important use). Safety matches (red P on box). Detergents (phosphates). DNA/RNA/ATP (biological). Organophosphate pesticides. Phosphoric acid production. Steel deoxygenation.
White phosphorus: extremely toxic (LD50: 1 mg/kg oral, rat), pyrophoric (ignites in air above 30 C), causes severe burns. Store under water. Red phosphorus: much less toxic but combustible. Phosphine (PH3) gas: extremely toxic.
The formula or notation for Phosphorus is: P4