The Prefix is Otterbox's least expensive iPhone case. The durable silicone, polycarbonate skeleton build of the OtterBox Prefix is thicker than the Commuter and Reflex, but also the least protective. The Prefix is a one-piece case, meaning that it does not snap in place like the Reflex .
carbon is considered tetravalent because it has four valence electrons the valence electrons are in the outermost shell of the atom and allows carbon to form four bonds to other atoms
It is TETRAHEDRAL about the carbon like methane. However, Unlike methane the tetrahedral shape is NOT symmetric. This is because the oxygen, which combines directly to the carbon is a much larger atom than hydrogen. This distorted tetrahedral shape then has a 'tail' on the oxygen , which is the hydrogen of the alcohol. The bond angles about the carbon are all 109.5 degrees About the carbon the four carbon electrons combine in the following way. Three electrons combine with the three hydrogens in the usual way.