Naming and Writing the Formulas of Compounds Containing Polyatomic Ions. A B; Hydrogen Acetate: HC2H3O2: Lithium Acetate: LiC2H3O2: Lithium Hydrogen Carbonate: LiHCO3: Learn polyatomic+ions charge names formulas with free interactive flashcards. Choose from 500 different sets of polyatomic+ions charge names formulas flashcards on Quizlet. What is the naming convention for the oxyanions ClO-, ClO2-, ClO3- and ClO4-? Answer and Explanation: The anions given in the question belong to the class of anions generally referred as oxyanions. Sep 25, 2015 · An oxyanion is a polyatomic ion composed of an element, usually a nonmetal, bonded to one or more oxygen atoms. It's name is based on the number of oxygen atoms in the ion. Asked in Geometry Free flashcards to help memorize facts about 24 polyatomic ions for TL. Other activities to help include hangman, crossword, word scramble, games, matching, quizes, and tests.