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From Citizendium, the Citizens' Compendium

Contents 1 CAS Registry ID: 2 Physical Properties 3 Compounds 4 Uses 5 Hazard 6 Stability

CAS Registry ID:

Synonyms: red phosphorus
Molecular formula: P
CAS No: 7723-14-0

Synonyms: yellow phosphorus
Molecular formula: P
CAS No: 7723-14-0

Physical Properties

Properties of Phosphorus
Atomic symbol:	P
Atomic mass:	30.973761
Atomic number:	15
Electronegativity:	2.19
Elemental Class:	Non-Metal
Boiling point:	280.5°C* *white phosphorus
Please see template {{Props}} for instructions on adding new properties of Phosphorus to this table.

Compounds

Uses

Hazard

The red allotrope of phosphorus is relatively harmless physiologically, unless it contains some of the white allotrope, which is very toxic. Irritant. Contact with eyes may cause irritation or burns. In contrast with the red allotrope, the white (yellow) allotrope of phosphorus is very toxic if swallowed or inhaled, and may cause severe burns.

Stability

Stable. Highly flammable. Incompatible with strong oxidizing agents, strong bases. Light and heat sensitive.