Which term is used to describe the form of oxygen in which each molecule contains three oxygen atoms?

• A. Ozone
• B. Oxygen gas
• C. Peroxide
• D. Oxide

Answer: (A)

Verified step by step guidance

1. Understand that oxygen can exist in different molecular forms, called allotropes, which differ in the number of oxygen atoms per molecule.
2. Recall that the most common form of oxygen is diatomic oxygen, represented as \(\mathrm{O}_2\), which is the oxygen gas we breathe.
3. Recognize that the term 'oxide' generally refers to compounds containing oxygen combined with other elements, not pure oxygen molecules.
4. Know that 'peroxide' refers to a compound or ion containing an oxygen-oxygen single bond, typically \(\mathrm{O}_2^{2-}\), and is not a pure form of oxygen gas.
5. Identify that the form of oxygen consisting of three oxygen atoms per molecule is called 'ozone', represented as \(\mathrm{O}_3\).