Naming Ionic Compounds: Ions, Polyatomic Ions, and Writing Formulas, Slides of Chemistry

Download Naming Ionic Compounds: Ions, Polyatomic Ions, and Writing Formulas and more Slides Chemistry in PDF only on Docsity! ws © “ a a © Naming Compounds - « Palin Compounds*and Polyatomic lons s “ " a ' Formation of Ions from Metals Metals _lose__ electrons to match the number of _valence electrons__ of their nearest noble gas _positive ions__ form when the _#of electrons__ are _less than__ the _# of protons__ This value is the _# of oxidation or the charge of the ion __ Group 1 metals  ion 1+ Group 2 metals  ion 2+ • Group 13 metals  ion 3+ Names of Some Common Ions Formulas and Names of Some Common Ions Group Group Number fFormulaoflon Nameoflon Number Formula of lon Name of lon Metals Nonmetals 1A (1) Li* Lithium 5A (15) Nitride Sodium Phosphide Potassium 6A (16) Oxide Magnesium Sulfide Calcium 7A (17) Fluoride Barium Chloride Aluminum ~ Bromide Iodide Naming Ionic Binary Compounds (binary means 2 elements) • To name a compound with 2 elements, • Name the _metal__ followed by the _nonmetal__ • Change the _ending of the nonmetal to -ide__ • Examples: • NaCl • Ba3N2 Examples of Ionic Compounds with Two Elements Formula cation anion Name NaCl Na+ Cl- K2S MgO CaI2 Al2O3 Example #1 Barium Nitride Ba has a charge of _2+___, N has a charge of _3-___ Swap the charges or each element and use them as subscripts in the formula ---> _Ba2(N3)______ If the oxidation number (charge) is the same number for both elements, they cancel out. Example #2 Calcium Oxide Ca ___ and O ____ Subscripts should always be in their ___. (This is called an ___.) Writing Formulas with Polyatomic Ions • Use Criss-Cross Method to write formula with Polyatomic Ions • If there is more than one polyatomic ion, place the ___. • ___ of the polyatomic ion or ___. Examples: Aluminum Sulfate Sodium Phosphate Al and (SO4) Na and (PO4)