We’re being asked to determine the oxidation state of Cr in Na2CrO4
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
What is the oxidation number of the chromium atom in Na2CrO4 ?
A) +7
B) +6
C) -2
D) +2
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