Diatomic elements

H₂, N₂, O₂, F₂, Cl₂, Br₂, and I₂

Allotropes – Elemental molecules with different formulas. i.e. O₂ and O₃

Ionic compounds – metal and nonmetal (can be polyatomic too)

Molecular compounds – two or more nonmetals

Naming ionic compounds

1. Name the metal.
2. Write the metal’s oxidation state as a Roman numeral in parenthesis.
3. Name the nonmetal using an “ide” ending
Ex. Iron (II) Chloride, FeCl2