The following questions are about ceramic silicon nitride size: 1) determine the type of chemical bonding between si and n, given the electronegativity of si and n are 1.8 and 3.0, respectively. 2) if si forms tetrahedron with n, what is the coordination number of si? what is the hybridization type of si, sp, sp or sp ? 3) how can the sina tetrahedra be linked to satisfy the 3: 4 ratio of si to n