🔍 Key Concepts

• Ozone is a molecule made only of oxygen atoms. • Compare how many oxygen atoms are in elemental oxygen gas versus ozone. • Chemical formulas use subscripts (small numbers) to show how many atoms are bonded together.

💭 Think About

• How many oxygen atoms are bonded together in one molecule of normal oxygen gas that we breathe? • How does ozone differ from normal oxygen gas in terms of the number of oxygen atoms? • Which option uses a subscript to show more than one oxygen atom in a single molecule?

✅ Before You Answer

• Make sure the choice you pick shows more than one oxygen atom in the molecule. • Confirm that the formula you pick contains only the element oxygen (O) and no other letters. • Check that the formula correctly uses a subscript number (like ₂ or ₃) to indicate how many O atoms are in each molecule.