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
Because since carbon is a group 4 element it has four bonds and can form an extremely wide range of compounds and molecular structures. Also, being in the middle of the period â¦ ic table it can bond with both metals and non metals. It is the main component of almost all long chain molecules.ecause since carbon is a group 4 element it has four bonds and can form an extremely wide range of compounds and molecular structures. Also, being in the middle of the period â¦ ic table it can bond with both metals and non metals. It is the main component of almost all long chain molecules.