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
Covalent compunds: write the element with a subscript that corresponds to the prefix. For example, carbon tetraiodide... Carbon is a nonmetal, and iodide is a nonmetal; therefore, carbon and iodide form a covalent compound. Thus, the covalent molecule nomenclature rules are used. Carbon is C, idodide is I, and tetra means 4, so. carbon tetraiodide is CI4. (hint: For our purposes, only covalent compounds use prefixes; therefore, the presence of a prefix means the compound must be covalent.) Acids: add as many protons (H+) as needed to cancel the charge of the anion.