| Property | White Phosphorus | Red Phosphorus |
|---|---|---|
| Physical State | Soft and waxy solid. | Hard and crystalline solid. |
| Odour | Garlic smell. | Odourless. |
| Toxicity | Poisonous. | Non-poisonous. |
| Solubility | Insoluble in water,soluble in $CS_2$. | Insoluble in both water and $CS_2$. |
| Reactivity | Undergoes spontaneous combustion in air. | Relatively less reactive. |
| Structure | Exists as discrete $P_4$ molecules. | Exists as a polymeric chain of tetrahedral $P_4$ units. |
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