# Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 86: 2.84

(a) CrO$_4$$^2- (b) CO_3$$^2-$ (c) SO$_4$$^2- #### Work Step by Step (a) CrO_4$$^2-$ (b) CO$_3$$^2- (c) SO_4$$^2-$

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