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en.wikipedia.org/wiki/Oxidation_state

The oxidation state, often called the oxidation number, is an indicator of the degree of oxidation .... 2. Oxygen is assumed to have its usual oxidation state of − 2, and so the sum of the oxidation states of all the atoms can be expressed as x +  ...

www.chemguide.co.uk/inorganic/redox/oxidnstates.html

Peroxides include hydrogen peroxide, H2O2. This is an electrically neutral compound and so the sum of the oxidation states of the hydrogen and oxygen must ...

chemed.chem.purdue.edu/genchem/topicreview/bp/ch2/oxnumb.html

2. The oxidation number of simple ions is equal to the charge on the ion. The oxidation number of ... Oxygen usually has an oxidation number of -2. Exceptions  ...

www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number

Above it says, "oxygen is usually assigned a −2 oxidation number (except in peroxide compounds where it is −1, and in binary compounds with fluorine where it ...

chemistry.stackexchange.com/questions/66262/why-does-oxygen-in-oh-have-an-oxidation-state-of-2

You should be getting three lone pairs on oxygen and one O−H bond. ... The two extraneous electrons give an oxidation state of −II. Likewise, hydrogen has lost ...

www.khanacademy.org/science/chemistry/oxidation-reduction/redox-oxidation-reduction/v/unusual-oxygen-oxidation-states

Determining oxidation numbers in hydrogen peroxide, H₂O₂, and oxygen difluoride, OF₂. ... How many oxidation states are there besides -2 and -1 ? 8 Votes.

www.dummies.com/education/science/chemistry/rules-for-assigning-oxidation-numbers-to-elements

Rule 5: The oxidation number of oxygen in a compound is usually –2. If, however, the oxygen is in a class of compounds called peroxides (for example, ...

www.science.uwaterloo.ca/~cchieh/cact/c123/oxidstat.html

Oxidation state is a number assigned to an element in a compound according to ... The oxidation state of oxygen in its compounds is -2, except for peroxides like ...

www.periodni.com/oxidation_numbers_calculator.php

To calculate oxidation numbers of elements in the chemical compound, enter ... Oxygen almost always has an oxidation number of -2, except in H2O2 (when it is  ...