Cyanide —CN -
Hydroxide— OH -
Hydrogen carbonate or Bicarbonate—HCO 3-
Hydrogen sulfate or Bisulfate—HSO 4-
Note the "ide" ending for cyanide and hydroxide. This ending is usually reserved for
simple monatomic anions (like chloride, Cl ). Cyanide and hydroxide are exceptions to
For hydrogen carbonate and hydrogen sulfate note that H has been added to a -2
oxyanion, reducing the charge by one. Older nomenclature uses the prefix 'bi' in place
Nomenclature of Binary Covalent Compounds
Nonmetals can combine with other nonmetals to make covalent compounds. Bi-
nary covalent compounds contain two nonmetals. Because nonmetals can share elec-
trons in covalent bonds in many different ways, it is necessary to specify the number of
each element in the compound.
CO = carbon monoxide.
CO 2 carbon dioxide.
The prefixes tell