periodic table Essay

periodic table Essay periodic table Essay Havergal College SCH3U Oxidation number and IUPAC names of some polyatomic ions Oxidation number = +1 Name Ammonium Oxidation number = -1 Name Ion cyanide HSO4acetate H2PO3hypochlorite H2PO4chlorite MnO4chlorate NO2perchlorate NO3hydrogen carbonate OCNhydrogen oxalate OHhydrogen sulfite SCNOxidation number = -2 Name Ion carbonate HPO42oxalate O22chromate SO32dichromate SO42hydrogen phosphite S2O32Oxidation number = -3 Name Ion 3arsenite PO4 arsenate Ion NH4+ Ion CNC2H3O2ClOClO2ClO3ClO4HCO3HC2O4HSO32- Ion CO3 C2O42CrO42Cr2O72HPO32Ion 3- AsO3 AsO43- Name hydrogen sulfate dihydrogen phosphite dihydrogen phosphate permanganate nitrite nitrate cyanate hydroxide thiocyanate Name hydrogen phosphate peroxide sulfite sulfate thiosulfate Name phosphate Solubility of Ionic Compounds at SATP - - Cations Cl , Br , I High solubility (aq) 0.1 mol/L (at SATP) Low solubility (s) 0.1 mol/L (at SATP) most - S 2- group 1, NH4+, group 2 OH - group 1, NH4+, Sr2+, Ba2+ Tl+ Anions SO42most CO32-, C2H3O2PO43-, SO32group most + 1, NH4 NO3all All Group 1 compounds, including acids, and all ammonium compounds are assumed to have high solubility in water + 2+ Ag , Pb , most most Ag+, Pb2+, most Ag+ none Tl+, Hg22+, Ca2+, (Hg+), Cu+ Ba2+, Sr2+, Ra2+ Havergal College SCH3U Assigning oxidation numbers General Rules 1) The oxidation number of any free element is zero, regardless of how complex its molecules might be. 2) For monatomic ions, the oxidation number is their charge 3) The sum of all the oxidation numbers of the atoms in a molecule or polyatomic ion must equal the charge on the particle Rules for Specific Atoms 4) Group 1A (1) atoms have an oxidation number of +1(Excluding H) 5) Group 2A (2) atoms have an oxidation number of +2 6) In its compounds, hydrogen is +1 with non-metals and -1 with