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
why is carbon is considered tetravalent since it has four electrons in its outermost orbital it needs four more electrons to complete its octet since it has two electrons in its outermost orbital it needs four more electrons to complete its octet