The oxidation number of chromium in Cr2O7 is +7. The oxidation number of oxygen is -2, so 7 O atoms times -2 = -14. In order to balance the -14 on the oxygen atom, each chromium atom must have an oxidation number of +7, because 2 Cr atoms times +7 equals +14.
True however I believe the question did not place Chromium in any compund therefore technically its oxidation number would be O as it is in its natural state as Cr.
Chromium (symbol: Cr) can have several oxidation numbers, depending on the nature of the compound it is found in. Possible oxidation numbers for Chromium are:
+1 for each Cs, -2 for each O, +6 for each Cr
The oxidation number of chromium in the dichromate polyatomic ion, Cr2O72-, is +6.
+6 for each Cr and -2 for each O
+6
6+
The oxidation state for oxygen in this compound is 2-, as it is for most oxygen compounds.
-2 for each O +6 for each Cr
+6 for each Cr -2 for each O
In CrBr (chromium monobromide) Cr would have an oxidation number of +1. This compound is not known perhaps you meant CrBr3, where chromium has an oxidation number of +3
6+
The oxidation state for oxygen in this compound is 2-, as it is for most oxygen compounds.
-2 for each O +6 for each Cr
+6 for each Cr -2 for each O
In CrBr (chromium monobromide) Cr would have an oxidation number of +1. This compound is not known perhaps you meant CrBr3, where chromium has an oxidation number of +3
Potassium's oxidation number is +1. Chromium's oxidation number is +6. Oxygen's oxidation number is -2.
In Cr2O72- chromium (Cr) has an oxidation number of 6+ while oxygen has an oxidation number of 2-.
+6
1
It is true for chromium. But O shows 2asthe oxidation number.
The possible oxidation numbers for iron cations are +2 and +3. Oxygen in oxyanions is usually assigned an oxidation number of -2, producing a total negative charge of -14 for the seven oxygen atoms in a dichromate anion. If the iron cation has an oxidation number of +2, the two chromium atoms must have a total oxidation number of +12, which is possible when each chromium atom has an oxidation number of +6. An iron (III) cation would require the chromium atoms to have a non integral charge, which is not possible since electrons with half charges are not known. Therefore, the oxidation number of iron in the compound is +2 and the oxidation number for chromium is +6.
The oxidation number of chromium varies from +2 to +6.