in the atmosphere, oxygen is available O2 but not O
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Oxygen by itself doesn't have enough electrons to be stable so it shares electrons with another oxygen atom. ... The symbol of Oxygen is O. Actually, oxygen is not called O2. O2 is a molecule of oxygen gas. Therefore it is the formula for Oxygen gas moleculeand not oxygen.
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O itself is not a stable compound so it cannot stay in atmosphere for long. This is because oxygen do not have all 8 electrons in its outermost shell. It have only six electrons. It combines with another oxygen molecule to form a covalent bond .
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