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Kruka [31]
3 years ago
7

What is the oxidation number of chromium in dichromate ion, cr2o72-?

Chemistry
1 answer:
castortr0y [4]3 years ago
8 0
Oxidation number is charge of element in compound. Can be neutral, positive or negative.
Oxygen in dichromate has oxidation number -2, becauce there are seven oxygens, net oxidation number of oxygen is -14.
2·x(oxidation number of Cr) + 7· (-2) = -2   2x= +12
x= +6, oxidation number of one chromium is +6.
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