Major Classes

• Ionic compounds
• Metal + nonmetal(s)
• Metal first in formula
• Binary ionic or compounds with polyatomic ions
• Molecular compounds
• 2 or more nonmetals
• Binary molecular (or binary covalent)
• 2 nonmetals
• Metalloids are named like nonmetals
• Acids—Formula starts with H
• Though acids are molecular, they behave as ionic when dissolved in water