Compounds and Bonding
SiC forms a covalent network with each atom obtaining the ‘noble gas configuration’ of electrons by sharing 4 outer electrons. It is a lattice as there is a regular repeating pattern in the structure. Every C is bonded to 4 Si, every Si is bonded to 4 C, so there is an equal number of each 4:4 Si to C which simplifies to the formula SiC.
SiO2 forms a covalent network with oxygen that is hollow, as it is not the same because there is not a complete lattice.
Around 2700oC, covalent network, strong bonds…