2. Polyatomic ions are groups of multiple atoms that have a charge (positive or negative). The symbols shown below tell you what elements are in the ion, how many atoms of each, and the charge. Chemistry I Polyatomic Ions Here’s a list of common polyatomic ions and acids: Ion Name Acid Formula Acid Name NH4 + Ammonium* NO3-Nitrate HNO3 Nitric Acid NO2-Nitrite HNO2 Nitrous Acid OH-Hydroxide* HOH Water (not really an acid) CN-Cyanide HCN Hydrocyanic Acid SCN-Thiocyanate HSCN Thiocyanic Acid ClO4-Perchlorate* HClO4 Perchloric Acid Memorization Hints: Polyatomic Ions Polyatomic Ions To Memorize. Strontium Chloride = Strontium ions and Chloride ions = Sr+2 and Cl‐ = SrCl 2 Multiples of polyatomic ions require parenthesis Ammonium Sulfate = Ammonium ions and Sulfate ions = NH 4 + and SO 4 2‐ = (NH 4) 2SO 4 Calcium Phosphate = Calcium ions and Phosphate ions = Ca2+ and PO 4 3‐ = Ca 3(PO) 2 For example, contains a nitrogen atom, three oxygen atoms, and the entire group has a charge of -1. acetate CH 3COO-1 acetylide -C 2 2 americyl AmO 2 +2 amide -NH 2 1 +1 ammonium +1NH 4 arsenate AsO 4-3 arsenite AsO 3-3-astatate AtO 3-1 azide -N 3 1 benzoate -C 6H 5COO-1 bicarbonate/hydrogen carbonate 3 HCO -1 binoxalate/hydrogen oxalate HOOCCOO-1 bismuthate BiO 3-1 bisulfate/hydrogen 4 + ammonium NO. Polyatomic Ion Table Formula Name Formula Name NO 3-nitrate ClO4-perchlorate NO 2-nitrite ClO3-chlorate CrO 4 2-chromate ClO2-chlorite Cr2O7 2-dichromate ClO-hypochlorite CN-cyanide IO 4-periodate SCN-thiocyanate IO 3-iodate MnO 4-permanganate IO2-iodite OH-hydroxide IO-hypoiodite O2 2-peroxide BrO4-perbromate NH 2-amide BrO3-bromate SO 4 2-sulfate BrO 1=mono, 2=di, 3=tri, 4=tetra, 5=penta, 6=hexa, 7=hepta, 8=octa . i.e. O + hydronium SO. Prefixes are used to specify the number of each atom present . +1 Cations -2 Anions. Link to Interactive Transitional Metal Polyatomic Ions * In Per manganate the Per means more charge (add +1 to manganate’s charge), not more oxygen as in perchlorate. Dichromate Cr 2 O 7-2-1 Anions Dibasic phosphate HPO 4-2 Why? NH. Polyatomic Ions . Thus, a polyatomic ion is an ion that is composed of 2 or more atoms. Hydronium H 3 O +1 Chromate CrO 4-2. 3 3– phosphite B. Binary Compounds between Two Nonmetals (molecular compounds) 1. 2 2+ mercurous ion / mercury(I) ion PO. An ion is an atom or molecule that has acquired an electric charge due to loss or gain of electrons. 3 2– sulfite Hg. A List of Common Polyatomic Ions With Charges and Oxidation Numbers. 2 – nitrite H. 3. ScienceStruck lists down some common polyatomic ions with their charges and oxidation numbers. Polyatomic ion names do not change . Students will not be expected to memorize any additional polyatomic ions for Pre-AP Chemistry courses taught in SBISD. Ammonium NH 4 +1 Carbonate CO 3-2. Pre-AP Chemistry Polyatomic Ions List Students enrolled in Pre-AP Chemistry in SBISD will be expected to memorize the names and formulas of the following polyatomic ions prior to the nomenclature unit. Therefore: Per manganate MnO 4 1- ** Group IVA oxyanions have 2-charges instead of the expected 4-! 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