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Oxygen

Oxygen is a chemical element with the chemical symbol O and atomic number 8. Oxygen is the most common element on Earth, and the second most common element in Earth's atmosphere (second to nitrogen). It composes around 49% of the mass of Earth's crust[1] and 28% of the mass of Earth as a whole, and is the third most common element in the universe. On Earth, it is usually covalently or ionically bonded to other elements. read more...

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Alkali Metals: Explosive Reactions in Water

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