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
To determine shape and polarity we have to look at the electron arrangement around the central atom; in this case that's the carbon atom, and the carbon atom has four groups of electrons, so it has a tetrahedral arrangement of electrons. Each of those four groups of electrons is a bond to a chlorine atom.There are no unbonded pairs of electrons, so the shape of the molecule is the same as the shape of the electron arrangement. It is a tetrahedral molecule.o determine shape and polarity we have to look at the electron arrangement around the central atom; in this case that's the carbon atom, and the carbon atom has four groups of electrons, so it has a tetrahedral arrangement of electrons. Each of those four groups of electrons is a bond to a chlorine atom.