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
6 Hydrogen, 3 Carbon. 8) Carbon atoms are the most versatile building blocks of the molecules used by living organisms because _____. each carbon atom acts as an intersection point from which a molecule can branch off in up to four directions. 9) The carbon atom is tetravalent; this means that _____. a carbon atom can complete its valence shell by forming four covalent bonds. 10) The carbon atom is tetravalent; this means that _____.