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Something I noticed whilst revising about Group 15 is, that the darker the allotrope of phosphorus, the more stable it is.

• White/yellow – very volatile, soluble, pyrophoric
• red – air stable, polymer, more stable, one cross link;
• black – most stable, polymer, max amount of cross link.

What's the reason for this? Or rather, why would a more stable allotrope have a darker colour?

Something I noticed whilst revising about group 15 is that the darker the allotrope of phosphorus, the more stable it is.

• white/yellow – very volatile, soluble, pyrophoric
• red – air stable, polymer, more stable, one cross link;
• black – most stable, polymer, maximum amount of cross link.

What's the reason for this? Or rather, why would a more stable allotrope have a darker colour?

Something I noticed whilst revising about Group 15 is, that the darker the allotrope of phosphorus, the more stable it is. White/yellow - very volatile, soluble, pyrophoric; red - air stable, polymer, more stable, one cross link; black - most stable, polymer, max amount of cross link. What's the reason for this? Or rather, why would a more stable allotrope have a darker colour?

Something I noticed whilst revising about Group 15 is, that the darker the allotrope of phosphorus, the more stable it is.

• White/yellow – very volatile, soluble, pyrophoric
• red – air stable, polymer, more stable, one cross link;
• black – most stable, polymer, max amount of cross link.

What's the reason for this? Or rather, why would a more stable allotrope have a darker colour?

Something I noticed whilst revising about Group 15 is, that the darker the allotrope of phosphorus, the more stable it is. White/yellow - very volatile, soluble, pyrophoric; red - air stable, polymer, more stable, one cross link; black - most stable, polymer, max amount of cross link. What's the reason for this?

Something I noticed whilst revising about Group 15 is, that the darker the allotrope of phosphorus, the more stable it is. White/yellow - very volatile, soluble, pyrophoric; red - air stable, polymer, more stable, one cross link; black - most stable, polymer, max amount of cross link. What's the reason for this? Or rather, why would a more stable allotrope have a darker colour?