Rules for Determining the Oxidation State (Number)
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Created by:
annehaskins on October 12, 2011
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6 terms
Terms | Definitions |
|---|---|
 Element | The oxidation state (number) of atom in an element is ALWAYS zero |
| Monoatomic Ions | The oxidation state (number) of an atom in a monatomic ion EQUALS the charge on the ion |
| Oxygen | The oxidation state (number) of oxygen is -2 in MOST compounds (Exceptions: Hydrogen Peroxide H2O2 and other peroxides, where it is -1) |
| Hydrogen | The oxidation state (number) of hydrogen is +1 in MOST of its compounds (Exceptions: Metal Hydrides, such as NaH or CaH2, where it is -1) |
| Halogens | The oxidation state (number) of fluorine is -1 in ALL compounds. Each of the other halogens (Cl, Br and I) has an oxidation number of -1 in binary compounds, except when the other element is a halogen above in the periodic table or oxygen. |
| Compounds and Ions | The sum of the oxidation states (numbers) of the atoms in a compound is ZERO. The sum of the oxidation numbers of atoms in a polyatomic ion EQUALS the charge on the ion. |
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