Question #14e7a Chemistry Ionic Bonds Polyatomic Ions 1 Answer BRIAN M. Feb 6, 2014 The most common polyatomic ion with a -3 charge is #PO_4^(-3)# which is phosphate. However, #AsO_4^(-3)# arsenate and #BO_3^(-3)# Borate also are negative polyatomic ions with charges of -3. Answer link Related questions How do you draw the lewis structure for polyatomic ions? The number of protons are not suppose to be equal to the number of electrons? How come we are... How do you calculate the total number of protons and electrons in a polyatomic Ion. Do you have... Question #e03c2 Question #9759d Question #79430 Question #79c1f Question #79c23 Question #600e6 Question #67e6a See all questions in Polyatomic Ions Impact of this question 3622 views around the world You can reuse this answer Creative Commons License