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Oxygen is a small size atom known to make only two bonds (sigma bonds), it may also form coordination bonds {oxygen ion (2-) uses its outer shell in coordination (only s & p orbitals) that theoretically form a maximum of four bonds}. In the decavanadate ion cluster (V10O28)6-, there are oxygen atoms with one bond, two bonds, three bonds and six bonds. Can anyone explain how oxygen can bridges 3 and 6 atoms in this structure

Omar
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    There were numerous theoretical investigations on this polyoxometalate, and most of the point to these six bonds having ionic nature. Once this is proved, there is no element of surprise anymore. – andselisk May 28 '21 at 07:23
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    I would suggest to draw an image of the cluster using any CIF and post V−O bond lengths to better illustrate your question. – andselisk May 28 '21 at 07:25
  • The V-O distance varies in literature, almost 2.1077 - 2.3382 Å – Omar May 28 '21 at 09:26
  • It is also drawn as a solid line in all crystal structures, I believe no solid line between the atoms should be drawn if it is ionic – Omar May 28 '21 at 09:27
  • +1 for element of surprise. Perhaps a stable transuranic? – DrMoishe Pippik May 28 '21 at 21:46
  • related https://chemistry.stackexchange.com/questions/121196/why-cant-o-form-of6 – Mithoron May 29 '21 at 00:31

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