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• Assign oxidation numbers to atoms in elements, compounds and ions.

Oxidation Numbers. • Assign oxidation numbers to atoms in elements, compounds and ions. • Use a Roman numeral to indicate oxidation states. Oxidation Numbers. The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O 2. Oxidation Numbers.

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• Assign oxidation numbers to atoms in elements, compounds and ions.

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  1. Oxidation Numbers • Assign oxidation numbers to atoms in elements, compounds and ions. • Use a Roman numeral to indicate oxidation states.

  2. Oxidation Numbers • The oxidation number of an atom in an element is zero. E.g. Mg in Mg, O in O2.

  3. Oxidation Numbers • The oxidation numbers of certain atoms rarely change.

  4. Oxidation Numbers • The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of S in S2-? -2

  5. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of C in CO2? ? – 4 = 0 ? = +4 Put the +!

  6. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of Mg in MgCl2? +2

  7. Oxidation Numbers • The oxidation numbers of atoms in a compound add up to zero. Oxidation state of N in NH3? -3

  8. Oxidation Numbers • The oxidation numbers of atoms in an ion add up to the charge on the ion. Oxidation state of N in NH4+? -3

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