Carbon has an oxidation number of +2 and a formal charge of -1 in the follow-Lewis structure.
The oxidation number, sometimes referred to as the oxidation state, is the total number of electrons that an atom gains or loses in order to form a chemical connection with another atom.
An atom with a charge from the gain or loss of electrons is known as an ion. The superscript following the atom denotes the charge.
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For the carbon atom of carbon monoxide, the formal charge is ___(i)_____ and the oxidation number is _____(ii)_____.