Answer:
Zero
Step-by-step explanation:
The oxidation state of an element that is not involved in bonding is zero. An atom in its free and uncombined state has zero oxidation number.
The extent of oxidation of each atom of the elements in a molecular formula or formula unit or an ionic radical is given by the oxidation number.
- The formal charge assigned to an atom present in a molecule or a formula unit or ion based on some arbitrary rules is given by the oxidation number.
- Elements in their uncombined state or one whose atom combine with themselves to form molecules have zero oxidation number.