Oxygen's Allotropes and Oxidizing Strength
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State
Oxygen exists as allotropes O2 and O3, and reacts, as the second-strongest oxidizer after fluorine, with nearly every element except the noble gases, halogens, and a few unreactive metals.
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Stratospheric ozone absorbs UV light, decomposing into O2 and a reactive oxygen atom that makes ozone a bleach.
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Ozone's oxidizing strength doesn't make it more stable — O2 is the stable form.