Answer: It would have 8 electrons in its outermost shell.
Step-by-step explanation:
The outermost shell of an Oxygen atom, usually called valence shells contains only 6 electrons while the rest 2 are in the innermost shell.
When chemicals bonds are formed, it takes in just 2 more electrons from the donor atom to form a stable octet state.
Example is the covalent bond between Hydrogen atom. (Check attatchment)