Explain the difference between allotropes (O2 vs. O3).
Allotropes are different forms of an element that each have distinctly different physical or chemical properties. Oxygen exists as two allotropes, which are O2 and O3. O2 is known as oxygen gas, and makes up 20% of the air we humans breathe. On the other hand, O3 is known as ozone, and is a gaseous substance found in the upper layers of our planet's atmosphere, and can cause air pollution.
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