Dichromate Cr 2 O 7-2-1 Anions Dibasic phosphate HPO 4-2 Why? +1 Cations -2 Anions. 1=mono, 2=di, 3=tri, 4=tetra, 5=penta, 6=hexa, 7=hepta, 8=octa . 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 3 3– phosphite Memorization Hints: Polyatomic Ions Ammonium NH 4 +1 Carbonate CO 3-2. Hydronium H 3 O +1 Chromate CrO 4-2. Thus, a polyatomic ion is an ion that is composed of 2 or more atoms. 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. Polyatomic Ions To Memorize. The symbols shown below tell you what elements are in the ion, how many atoms of each, and the charge. 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 4 + ammonium NO. Polyatomic ions are groups of multiple atoms that have a charge (positive or negative). Therefore: Per manganate MnO 4 1- ** Group IVA oxyanions have 2-charges instead of the expected 4-! 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. POLYATOMIC IONS CHART NAME: 1- Charge 2- Charge 3- Charge Aluminate AlO 2 − Tetraborate B 4 O 7 2-Arsenite AsO3 3− Metaborate BO 2 2+ mercurous ion / mercury(I) ion PO. A List of Common Polyatomic Ions With Charges and Oxidation Numbers. If first atom is a single atom then prefix “mono’ is omitted . 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 ScienceStruck lists down some common polyatomic ions with their charges and oxidation numbers. Polyatomic ion names do not change . 3 2– sulfite Hg. Prefixes are used to specify the number of each atom present . 2 – nitrite H. 3. NH. 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 For example, contains a nitrogen atom, three oxygen atoms, and the entire group has a charge of -1. POLYATOMIC IONS. O + hydronium SO. i.e. An ion is an atom or molecule that has acquired an electric charge due to loss or gain of electrons. Polyatomic Ions . Students will not be expected to memorize any additional polyatomic ions for Pre-AP Chemistry courses taught in SBISD. 2. B. Binary Compounds between Two Nonmetals (molecular compounds) 1. The symbols shown below tell you what elements are in the ion, how many atoms of each atom.... Electric charge due to loss or gain of electrons gain of electrons or... 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