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Oxygen can form double, single, or triple bonds depending on the atom it is bonding with. Oxygen can form a triple bond with Carbon since the total number of valence electrons is 10 which means that there are 5 pairs of electrons. The only way that you can form five pairs of electrons for a CO Lewis Structure is by having Oxygen and Carbon share three pairs with one lone pair on each atom.
Oxygen can have all types of bonds, but it usually does not have triple bonds because the formal charge of oxygen would be more likely to have a nonzero value. This is because oxygen has 6 valence electrons and a triple bond would cause the formal charge to usually be 1.
Oxygen is able to form single, double, or triple bonds depending on the formal charges of an overall structure or the number of electrons needed. Oxygen typically forms double bonds because it allows for a formal charge of 6 with 4 valence electrons.
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