Chemical Nomenclature - Norris Science

Chemical Nomenclature - Norris Science

Chemical Nomenclature Ionic Compounds Ionic Compounds Anion = atoms with a negative charge Cation = atoms with a positive charge Anions and Cations attract one another to form ionic bonds. Very easy to predict because they always work to neutralize the charges.

Ionic Compounds To name an ionic compound: Cation anion ide Example: NaCl Sodium Chloride Practice Name the following compounds: MgF2 Magnesium fluoride

LiBr Lithium bromide Cs2O Cesium oxide CaS

Calcium sulfide Transition Metals Transition Metals are tricky because they can take on a variety of charges. Ex: CuCl CuCl2

Transition Metals We distinguish between the different forms of transition metals using Roman Numerals. A Roman Numeral placed within parentheses after the name of a cation denotes the positive charge of that cation. Keys to Remember Remember! Roman Numerals tell the charge of the ions The charges of the ions determine the ratio in

which they combine Practice Name the following compounds: CrO Chromium (II) oxide FeF2 Iron (II) fluoride

HgBr Mercury (I) bromide SnI4 Tin (IV) iodide Practice Translate the following names into chemical formulas:

Iron (III) oxide Fe2O3 Beryllium chloride BeCl2 Tin (II) sulfide SnS

Potassium iodide KI Polyatomic Ions Some ions are called polyatomic ions because they consist of a group of atoms Polyatomic Ions

When you write a chemical formula that involves polyatomic ions, you still need to balance charges to form a neutral atom. Polyatomic Ions Sometimes polyatomic ions occur multiple times within a compound: 1. Put the polyatomic ion in parentheses 2. add the subscript outside the parentheses Ex: (SO4)2

Polyatomic Ions Ite/ate pairs: ate ions have one more oxygen than the -ite ion, but the same overall charge. Practice Name the following compounds that contain polyatomic ions: Mg3(PO4)2

Magnesium phosphate Pb(C2H3O2)2 Lead (II) acetate Cr(NO3)3 Chromium (III) nitrate (NH4)2C2O4

Ammonium oxalate Practice Write the formula for the following compounds that contain polyatomic ions: Potassium sulfate K2SO4 Lead (II) dichromate

PbCr2O7 Ammonium chloride NH4Cl Sodium hydroxide NaOH

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