The branch of chemistry known as stereochemistry studies and modifies the relative spatial arrangement. For each atom in a Lewis structure, you should count how many electrons it "owns" in order to get the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted.
Only two of its electrons are in bonding pairs, leaving six in non-bonding pairs. The formal charge is therefore six.
If it contains both two lone pairs and two bonds, like water does, it will have a formal charge of zero. It will have a formal charge of 1 if it has one bond and three lone pairs, similar to the hydroxide ion.
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