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  1. › wiki › OxygenOxygen - Wikipedia

    17 hours ago · Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium. About 0.9% of the Sun 's mass is oxygen. Oxygen constitutes 49.2% of the Earth's crust by mass as part of oxide compounds such as silicon dioxide and is the most abundant element by mass in the Earth's crust.

    • gas: colorless, liquid and solid: pale blue
    • 461000 ppm
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