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It has one, double bond.

An Oxygen atom has an electronic configuration of (2,6) in other words, there are 2 electrons in the lowest shell, closest to the nucleus, and then 6 outer (valence) electrons. To become totally stable, the Oxygen atom must gain 2 electrons to complete it's highest energy level, so in this instance it shares 2 electrons with another Oxygen atom to make O2

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Q: How many covalent bonds does the molecule O2 have?
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