12 icosahedra in which Just about every boron atom has five nearest neighbors throughout the icosahedron. In case the bonding had been the standard covalent form then Each individual boron would have donated 5 electrons. Even so, boron has only 3 valence electrons, and it is assumed the bonding from https://careers.coloradopublichealth.org/employers/d9be35c1-bfd8-4f5f-ab33-45d1752be783/edit