Binary Covalent Nomenclature
- Constructing the names for binary covalent compounds
-If the subscript for the element is greater than one, we start the name for N2O3 with di- followed by the element's name.
-Add -ide to the end of the name.

Cations names and formulas
-There is only one common polyatomic ion. Its formula is NH4+ (ammonium).
-The Roman numeral in each name represents the charge on the ion and allows us to distinguish between more than one possible charge.
-If the atoms of an element always have the same charge, the Roman numeral is unnecessary (and considered to be incorrect).

Anions names and formulas
-The monatomic anions are named by adding -ide to the root of the name of the nonmetal that forms the anion.
-Some polyatomic anions are formed by the attachment of one or more hydrogen atoms, without carrying its electrons.
-These polyatomic ions are named with the word hydrogen in front of the name of the anion.

Ionic Nomenclature
-For Ionic compounds, the names metallic elements comes first followed by the nonmetallic element