Nomenclature. How to name all those pesky compounds. Naming Ionic Compounds. Binary Compounds Charges must be equal. Combine cation name with anion name. The cation comes first followed by the anion. The cation gets the element name The anion is truncated and has …ide appended to it.
How to name all those pesky compounds
Steps to write formulas of ionic compounds
1. write formulas of ions, positive one first.
2. use subscripts to increase the number of ions in the compound until the charges are equal but opposite (multiplication!!! and least common multiple)
- to show more than one polyatomic ion, put parentheses around it and then use a subscript to balance charge
3. the final formula: rewrite so no charges are showing.
4. Check to see if empirical formula (lowest ratio of ions)
Steps to naming an ionic compound from its formula
1. State the names of the ions involved, putting the cation (positive) name first
2. If the cation has more than one possible charge, name it properly (stock or traditional) by determining its charge using the anion
-name tells what ions are involved but NOT how many
-total negative = total positive, so compound is neutral
-use least common multiple to help find charge and/or number of ions
* "mono" is omitted for the first part of the name
MgI2 Magnesium Iodide
K2O Potassium Oxide
FeO Iron(II) Oxide
Fe2O3 Iron(III) Oxide
Cu3(PO4)2 Copper(II) Phosphate
CuCN Copper(I) Cyanide
Co2(CO3)3 Cobalt(III) Carbonate
PbO2 Lead(IV) Oxide