12 Icosahedra by which Each individual boron atom has five closest neighbors inside the icosahedron. In case the bonding were the standard covalent kind then each boron would've donated 5 electrons. On the other hand, boron has only 3 valence electrons, and it is believed that the bonding within the https://jobboard.militarytimes.com/employers/ec8be146-4aa6-46c0-bac2-7d9d1296a8d3/edit