We’re being asked todetermine the oxidation state of each elementinK2Cr2O7 (potassium dichromate).

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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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What is the oxidation state of each element in K2Cr2O7?

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