Within the highly complex, butterfly-like spatial geometry of a completely isolated dichromate ion (), exactly how many distinct bonds are structurally defined as non-bridging, strictly equivalent ter

Question

Within the highly complex, butterfly-like spatial geometry of a completely isolated dichromate ion ($Cr_2O_7^{2-}$), exactly how many distinct $Cr-O$ bonds are structurally defined as non-bridging, strictly equivalent terminal bonds?

Prashant Kotian · Accepted Answer

Correct answer: 6. The dichromate ion consists of two tetrahedral units sharing exactly one bridging oxygen atom. This creates two central, elongated bridging bonds. The remaining oxygen atoms reside on the periphery; each chromium atom is bonded to three of these terminal oxygen atoms. Due to rapid internal resonance, all of these terminal bonds are strictly identical in length and bond order.

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