Polyatomic Ions.docx

Polyatomic Ions Some groups of atoms serve as building blocks for molecules of greater complexity. Several of these polyatomic units have an electronic imbalance, and are therefore said to be charged. Charged polyatomic units are called polyatomic ions. These charges are represented as superscripts that follow the formula.

1- ions perchlorate - ClO4chlorate - ClO3chlorite - ClO2hypochlorite - ClO-

2- ions sulfate - SO42sulfite - SO32-

perbromate - BrO4bromate - BrO3bromite - BrO2hypobromite - BrO-

chromate - CrO42dichromate - Cr2O72-

nitrate - NO3nitrite - NO2periodate - IO4iodate - IO3-

3- ions phosphate - PO43-

thiosulfate - S2O32-

carbonate - CO32oxalate - C2O42tartrate - C4H4O62peroxide - O22-

hydroxide - OHcyanide - CNthiocyanate - SCNpermanganate - MnO4amide - NH2azide - N3acetate - CH3COOMercurous Hg22+ Mercury Hg 2+ Zn 1+ Ag 1+

1+ ion ammonium – NH4+