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
Not only can objects be chiral, molecules can be chiral, too. The feature that most often is the cause of chirality in a molecule is an asymmetric carbon. (Other features that cause chirality are relatively uncommon and are beyond the scope of this book.e will see that atoms other than carbon, such as nitrogen and phosphorus, can be chirality centersâwhen they are bonded to four different atoms or groups (Section 5.17). In other words, an asymmetric carbon is just one kind of chirality center. A chirality center also belongs to a broader group known as stereocenters.