Milady Esthetics State Board Practice Test

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What is the composition of ozone?

Two oxygen atoms
Three oxygen atoms
One oxygen atom
Four oxygen atoms

The correct answer is: Three oxygen atoms

Ozone is composed of three oxygen atoms, which is represented chemically as O₃. This triatomic structure allows ozone to exist in the atmosphere, where it plays a critical role in absorbing harmful ultraviolet (UV) radiation from the sun. The unique composition of three oxygen atoms distinguishes ozone from molecular oxygen, which consists of two oxygen atoms (O₂). The presence of an extra oxygen atom in ozone is significant as it contributes to its distinct properties and functions, including its ability to react with other substances and its role in atmospheric chemistry. Understanding this composition is essential for various applications in environmental science, health, and safety, particularly in discussions surrounding air quality and the ozone layer.