What is the oxidation state of Cr in Cr2O7²-

1.	What is the oxidation state of Cr in Cr2O7²-
Answer» Oxygen is more electronegative than chromium, so it'll take its usual −2 charge here. There are seven oxygen atoms, so the total charge is −2⋅7=−14. Let x be the oxidation number of two chromium atoms. So, we got: x+(−14)=−2 x−14=−2 x=12 So, two chromium atoms have a total oxidation number of +12. Since one is not more electronegative than the other, we can divide the number by two to get one chromium's oxidation number. 12/6 =6 So, a chromium atom here has an oxidation number of +6.

Answer»

Oxygen is more electronegative than chromium, so it'll take its usual −2 charge here. There are seven oxygen atoms, so the total charge is −2⋅7=−14.

Let x be the oxidation number of two chromium atoms. So, we got:

x+(−14)=−2

x−14=−2

x=12

So, two chromium atoms have a total oxidation number of +12. Since one is not more electronegative than the other, we can divide the number by two to get one chromium's oxidation number.
12/6 =6

So, a chromium atom here has an oxidation number of +6.

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What is the oxidation state of Cr in Cr2O7²-

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