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
Use in that industry has declined because it is toxic when inhaled or absorbed through the skin, and it is no longer used in products for the home. Since carbon tetrachloride is a good solvent, it is used to dissolve things like oils, fragrances, and colors from flowers and seeds. Carbon tetrachloride is not flammable, so it can be used in fire extinguishers or as an additive to make other chemicals nonflammable.