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
carbon is a non metal because metals give electrons and form electrovalent bond they are highly electropositive in all metals they loose electrons easily in carbon it is not possible carbon mostly forms covalent bonds carbon form long chain therefore it is studied separately in organic chemistry