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7 votes

Are there any 2D materials whose bonding can be best described as metallic rather than covalent?

Yes, there are many of them. Some examples from Wikipedia: The presence of the Fermi level and electrons in the conduction band of h-MBenes (MBenes in hexagonal conformation ), cause the intrinsic ...
Paul Kolk's user avatar
  • 260
3 votes

Why does triiodide have only single bonds?

It goes the other way: triiodide ion actually has only one covalent bond, delocalized over the two linkages: $\ce{\overset{-}{I}:}\space\space\space\space\ce{I – I <-> I – I}\space\space\space\...
Oscar Lanzi's user avatar
  • 59.3k

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