Chemical Compounds Chemical Names

Naming of Cations Name of the element + the word ion Examples: Na + - Mg 2+ - Al 3+ - Sodium ion Magnesium ion Aluminum ion ** If it’s a Transition Metal Use a Roman numeral that represents the charge of the ion. Example: Cu 2+ - Fe 3+ - Copper (II) ion Iron (III) ion

Naming of Anions Name of the element with an –ide ending Examples: Cl - - F - - O 2- - Chloride ion Fluoride ion Oxide ion

SnS 2 Naming Binary Ionic Compounds Use Middle Name Tin(IV) Find Sn Where is it located? -2 Sulfide +4 +2

Polyatomic Ions Tightly bound groups of atoms that behave as a unit and carry a charge. Ammonium NH 4 + Cyanide CN - Sulfite SO 3 2- Examples:

Writing Formulas for Ternary Ionic Compounds A. Contain a polyatomic ion B. Same rules as for binary ionic compounds. One addition – Use parenthesis if there is more than one polyatomic ion Ex: Calcium Hydroxide Ca 2+ OH - CaOH 2 Ca(OH) 2

Boron acetate B 3+ C 2 H 3 O 2 -1 B(C 2 H 3 O 2 ) 3 Magnesium Dichromate Mg +2 Cr 2 O 7 -2 Mg 2 (Cr 2 O 7 ) 2 MgCr 2 O 7

Naming Ternary Ionic Compounds Same rules as for naming binary ionic compounds: –Name the cation – Use a Roman numeral if necessary –Name the anion –Do not use the word “ion” in the compound name

Add to your Periodic Table Write the two charges in the element’s box. Hg +1 & +2 Nickel +2 & +3 Gold +1 & +3

Rules for Naming Covalent Compounds 1. Prefixes are used to show how many atoms of each element are present in the compound Prefixes used for Naming Binary Covalent Compounds

2. Second element is written with an – ide ending. ***All binary compounds, both ionic and covalent end in –ide. 3. The vowel at the end of the prefix is dropped when the name of the element begins with the same vowel. Example: monoxide, not monooxide Rules for Naming Covalent Compounds

4. Mono is omitted if there is just a single atom on the first element in the name. Example: carbon dioxide not monocarbon dioxide Rules for Naming Covalent Compounds