Calculate Oxidation Numbers Video Lessons

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Concept:

Problem: The substances NaF and CaO are isoelectronic (have the same number of valence electrons).What are the charges on each of the cations in each compound?

FREE Expert Solution

We’re being asked to determine the charge (i.e. oxidation state) of each of the metal cations in:

  • NaF
  • CaO

The rules for oxidation states are as follows:


A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge


B. Specific Rules:

1. Group 1A              O.S. = +1

2. Group 2A              O.S. = +2

3. Hydrogen              O.S. = +1, with nonmetals

                                  O.S. = –1 with metals and boron

4. Fluorine                 O.S. = –1

5. Oxygen                  O.S. = –1 in peroxides (X2O2, X = Group 1A)

                                  O.S. = –1/2 in superoxides (XO2, X = Group 1A)

                                  O.S. = –2 in other compounds

6. Group 7A               O.S. = –1 (except when bonded to O)


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Problem Details

The substances NaF and CaO are isoelectronic (have the same number of valence electrons).

What are the charges on each of the cations in each compound?

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