Rules for Naming Binary Ionic Compounds

Order of Naming: The metal is named first, followed by the non-metal.
Metals in Specific Groups:
- If the metal is from Group 1, Group 2, or one of the metals silver (Ag), zinc (Zn), cadmium (Cd), or aluminum (Al):
- The name of the metal element is used directly. The group number indicates the ion's charge.
Naming Non-Metals:
- The non-metal becomes a negatively charged ion. The name is formed by dropping the element's ending and adding the suffix –ide.

Unit Formula: The smallest, simplest ratio of ions that form a crystal of an ionic compound.
Cation: A positively charged ion. Examples:
- $ext{Na}^{1+}$ (sodium)
- $ext{Mg}^{2+}$ (magnesium)
- $ext{Zn}^{2+}$ (zinc)
Anion: A negatively charged ion.

Element to Anion Name Conversion:
- Fluorine - Fluoride: $ext{F}^{1-}$
- Nitrogen - Nitride: $ext{N}^{3-}$
- Chlorine - Chloride: $ext{Cl}^{1-}$
- Phosphorus - Phosphide: $ext{P}^{3-}$
- Bromine - Bromide: $ext{Br}^{1-}$
- Arsenic - Arsenide: $ext{As}^{3-}$
- Iodine - Iodide: $ext{I}^{1-}$
- Carbon - Carbide: $ext{C}^{4-}$
- Oxygen - Oxide: $ext{O}^{2-}$
- Hydrogen - Hydride: $ext{H}^{1-}$
- Sulfur - Sulfide: $ext{S}^{2-}$
- Selenium - Selenide: $ext{Se}^{2-}$
- Tellurium - Telluride: $ext{Te}^{2-}$

Metals Not in Group 1 or 2:
- If the metal element is not in Group 1 or 2 and is not Ag, Zn, Cd, or Al:
- The name of the metal is still used, but it must include a Roman numeral in parentheses to indicate the positive charge of the ion.
Charge Determination:
- Metals outside Groups 1 or 2 can form multiple positive ions.
- To find the charge of the positive ion, first determine the charge of the negative ion and then use Berzelius’ Rule to balance the charges. The total must equal zero in a compound.