Write the rules to assign oxidation number.

1.	Write the rules to assign oxidation number.
Answer» or Assigning Oxidation Numbers Oxidation numbers are real or hypothetical CHARGES on atoms, assigned by the following rules: 1. Atoms in elements are assigned 0. 2. All simple monatomic ions have oxidation numbers equal to their charges. (e.g., all Group IA ions are +1; all group IIA ions are +2; all the following ions have oxidation numbers given by their charges - Fe2+, Al3+,s2-, N3-) 3. Fluorine is always -1 in its compounds. 4. Halogens are usually -1, except when a CENTRAL atom or when combined with a more electronegative ELEMENT (e.g., assign I as -1 in NI3, but +3 in ICl3). 5. Oxygen is -2 in most of its compounds, except in cases like peroxides (H2O2, Na2O2) where it is -1. 6. Hydrogen is usually +1, except in hydrides with electropositive elements, particularly with metal cations, where it is -1 (e.g., NaH,CaH2,BH4). 7. The sum of all oxidation numbers for a NEUTRAL compound is zero; the sum is the charge on the species for a complex ion.

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