what is oxygen gas
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oxygen (O2) can be a solid, liquid, or gas depending on temperature and pressure. But I'd guess you probably already know that and are asking why oxygen is a gas at normal earth temperatures and pressures.
The simple answer is that its boiling point at earth pressures is far lower than temperatures on earth. But that is a little circular.
To go a little deeper, we can say that the molecular weight of oxygen is low enough that the ambient temperature on earth is high enough to get them moving fast enough to overcome intermolecular forces and become a gas (or remain a gas).
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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other components. A gas that you cannot see, taste or smell. Plants and animals cannot live without oxygen .
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