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Answer: The total number of electrons that an atom acquires or loses in order to create a chemical connection with another atom is known as the oxidation number, also known as the oxidation state.
The charge of Cr2O72-, a polyatomic ion, is equal to the sum of the oxidation numbers.
Because there are seven oxygen atoms in a molecule, the overall charge is
-2⋅7=-14
Let x be the number of chromium atoms that have undergone oxidation.
⇒x+-14=-2 ⇒x-14=-2 ⇒x=12
The total oxidation number of two chromium atoms is + 12. We can acquire one chromium’s oxidation number by dividing the number by two. 12 / 2=6.
