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What are the steps to determine the formula for an ionic compound?

Identify charges, use crisscross method, reduce if possible.

How does the crisscross method work?

Charges are swapped between cations and anions.

What happens if you reduce the charges in ionic compounds?

You simplify the formula to its lowest terms.

What is the formula for Calcium Sulfide?

CaS.

What is the formula for Iron (III) Oxide?

Fe₂O₃.

How do you apply the crisscross method with polyatomic ions?

Treat the polyatomic ion as a single unit.

What is the naming convention for molecular compounds?

Use prefixes to indicate the number of atoms.

What is the formula for Lithium Oxide?

Li₂O.

What is the name of CO₂?

Carbon dioxide.

What prefix is used for two atoms in molecular compounds?

Di-.