Ionic Compounds and Their Naming

Examples of Ionic Compounds

Cesium and Nitrogen:

• Cesium (Cs): +1
• Nitrogen: -3
• Requires 3 Cs to pair with 1 N: Formula: $\text{Cs}_3 \text{N}$ → Name: Cesium Nitride.

Potassium Chloride:

• Formula: KCl → Name: Potassium Chloride.

Calcium Bromide:

• Calcium: +2
• Bromine: -1
• Formula: $\text{CaBr}_2$ → Name: Calcium Bromide.

Magnesium and Sulfur:

• Both +2/-2
• Formula: $\text{MgS}$ → Name: Magnesium Sulfide.

Iron Oxide:

• Can appear as $\text{FeO}$ or $\text{Fe}<em>2 \text{O}</em>3$; varies due to iron's multiple oxidation states.
• Naming requires Roman numerals to indicate the charge:
  • Example: $\text{Fe}^{2+}$ indicates Iron(II).

Transition Metals Naming Rules:

• Multiple Charges: Use Roman numerals to indicate charge.
  • Example: Iron(II) Chloride is $\text{FeCl}<em>2$; Iron(III) Chloride is $\text{FeCl}</em>3$